diff --git a/src/libs/languageserverprotocol/lsptypes.cpp b/src/libs/languageserverprotocol/lsptypes.cpp
index bd7798dcef9..72a5f9f4282 100644
--- a/src/libs/languageserverprotocol/lsptypes.cpp
+++ b/src/libs/languageserverprotocol/lsptypes.cpp
@@ -275,7 +275,7 @@ Position Position::withOffset(int offset, const QTextDocument *doc) const
     int line;
     int character;
     Utils::Text::convertPosition(doc, toPositionInDocument(doc) + offset, &line, &character);
-    return Position(line - 1, character - 1);
+    return Position(line - 1, character);
 }
 
 Range::Range(const Position &start, const Position &end)
@@ -288,11 +288,11 @@ Range::Range(const QTextCursor &cursor)
 {
     int line, character = 0;
     Utils::Text::convertPosition(cursor.document(), cursor.selectionStart(), &line, &character);
-    if (line <= 0 || character <= 0)
+    if (line <= 0 || character < 0)
         return;
     setStart(Position(line - 1, character - 1));
     Utils::Text::convertPosition(cursor.document(), cursor.selectionEnd(), &line, &character);
-    if (line <= 0 || character <= 0)
+    if (line <= 0 || character < 0)
         return;
     setEnd(Position(line - 1, character - 1));
 }
diff --git a/src/libs/utils/textutils.cpp b/src/libs/utils/textutils.cpp
index 8b17cc7e013..28a9e12e1bb 100644
--- a/src/libs/utils/textutils.cpp
+++ b/src/libs/utils/textutils.cpp
@@ -102,12 +102,12 @@ bool convertPosition(const QTextDocument *document, int pos, int *line, int *col
     QTextBlock block = document->findBlock(pos);
     if (!block.isValid()) {
         (*line) = -1;
-        (*column) = -1;
+        (*column) = 0;
         return false;
     } else {
         // line and column are both 1-based
         (*line) = block.blockNumber() + 1;
-        (*column) = pos - block.position() + 1;
+        (*column) = pos - block.position();
         return true;
     }
 }
diff --git a/src/libs/utils/textutils.h b/src/libs/utils/textutils.h
index 96b7afbeb86..80e4150c1d2 100644
--- a/src/libs/utils/textutils.h
+++ b/src/libs/utils/textutils.h
@@ -68,7 +68,7 @@ using Replacements = std::vector<Replacement>;
 
 QTCREATOR_UTILS_EXPORT void applyReplacements(QTextDocument *doc, const Replacements &replacements);
 
-// line is 1-based, column is 1-based
+// line is 1-based, column is 0-based
 QTCREATOR_UTILS_EXPORT bool convertPosition(const QTextDocument *document,
                                             int pos,
                                             int *line, int *column);
diff --git a/src/plugins/clangcodemodel/clangdqpropertyhighlighter.cpp b/src/plugins/clangcodemodel/clangdqpropertyhighlighter.cpp
index e6e32b0e9ee..4a8db524ce8 100644
--- a/src/plugins/clangcodemodel/clangdqpropertyhighlighter.cpp
+++ b/src/plugins/clangcodemodel/clangdqpropertyhighlighter.cpp
@@ -394,10 +394,10 @@ void QPropertyHighlighter::Private::addResult(TextStyle textStyle, int symbolOff
     const Symbol &s = parser.symbol_lookup(symbolOffset);
     int line, column;
     Utils::Text::convertPosition(document, position + s.from, &line, &column);
-    if (line > 0 && column > 0) {
+    if (line > 0 && column >= 0) {
         TextStyles styles;
         styles.mainStyle = textStyle;
-        results << HighlightingResult(line, column, s.len, styles);
+        results << HighlightingResult(line, column + 1, s.len, styles);
     }
 }
 
diff --git a/src/plugins/clangcodemodel/clangdsemantichighlighting.cpp b/src/plugins/clangcodemodel/clangdsemantichighlighting.cpp
index 30ffaa780e4..04bcc08fa2d 100644
--- a/src/plugins/clangcodemodel/clangdsemantichighlighting.cpp
+++ b/src/plugins/clangcodemodel/clangdsemantichighlighting.cpp
@@ -571,10 +571,12 @@ void ExtraHighlightingResultsCollector::insertAngleBracketInfo(int searchStart1,
     result.useTextSyles = true;
     result.textStyles.mainStyle = C_PUNCTUATION;
     Utils::Text::convertPosition(m_doc, absOpeningAngleBracketPos, &result.line, &result.column);
+    ++result.column;
     result.length = 1;
     result.kind = CppEditor::SemanticHighlighter::AngleBracketOpen;
     insertResult(result);
     Utils::Text::convertPosition(m_doc, absClosingAngleBracketPos, &result.line, &result.column);
+    ++result.column;
     result.kind = CppEditor::SemanticHighlighter::AngleBracketClose;
     insertResult(result);
 }
@@ -646,10 +648,12 @@ void ExtraHighlightingResultsCollector::collectFromNode(const ClangdAstNode &nod
         result.textStyles.mainStyle = C_PUNCTUATION;
         result.textStyles.mixinStyles.push_back(C_OPERATOR);
         Utils::Text::convertPosition(m_doc, absQuestionMarkPos, &result.line, &result.column);
+        ++result.column;
         result.length = 1;
         result.kind = CppEditor::SemanticHighlighter::TernaryIf;
         insertResult(result);
         Utils::Text::convertPosition(m_doc, absColonPos, &result.line, &result.column);
+        ++result.column;
         result.kind = CppEditor::SemanticHighlighter::TernaryElse;
         insertResult(result);
         return;
@@ -837,10 +841,12 @@ void ExtraHighlightingResultsCollector::collectFromNode(const ClangdAstNode &nod
             Utils::Text::convertPosition(m_doc,
                                          nodeStartPos + openingBracketOffset,
                                          &result.line, &result.column);
+            ++result.column;
             insertResult(result);
             Utils::Text::convertPosition(m_doc,
                                          nodeStartPos + closingBracketOffset,
                                          &result.line, &result.column);
+            ++result.column;
             insertResult(result);
         }
         return;
@@ -885,6 +891,7 @@ void ExtraHighlightingResultsCollector::collectFromNode(const ClangdAstNode &nod
     const int opStringOffsetInDoc = nodeStartPos + opStringOffset
             + detail.length() - opStringLen;
     Utils::Text::convertPosition(m_doc, opStringOffsetInDoc, &result.line, &result.column);
+    ++result.column;
     result.length = opStringLen;
     if (isArray || isCall)
         result.length = 1;
@@ -906,9 +913,11 @@ void ExtraHighlightingResultsCollector::collectFromNode(const ClangdAstNode &nod
         return;
     Utils::Text::convertPosition(m_doc, nodeStartPos + openingParenOffset,
                                  &result.line, &result.column);
+    ++result.column;
     insertResult(result);
     Utils::Text::convertPosition(m_doc, nodeStartPos + closingParenOffset,
                                  &result.line, &result.column);
+    ++result.column;
     insertResult(result);
 }
 
diff --git a/src/plugins/clangcodemodel/test/clangdtests.cpp b/src/plugins/clangcodemodel/test/clangdtests.cpp
index e66515365b2..a90126c00e8 100644
--- a/src/plugins/clangcodemodel/test/clangdtests.cpp
+++ b/src/plugins/clangcodemodel/test/clangdtests.cpp
@@ -1539,7 +1539,7 @@ void ClangdTestCompletion::testCompleteGlobals()
     Manipulator manipulator;
     item->apply(manipulator, cursorPos);
     QCOMPARE(manipulator.getLine(7), "   globalFunction() /* COMPLETE HERE */");
-    QCOMPARE(manipulator.cursorPos(), qMakePair(7, 20));
+    QCOMPARE(manipulator.cursorPos(), qMakePair(7, 19));
     QCOMPARE(manipulator.skipPos(), -1);
 }
 
@@ -1559,7 +1559,7 @@ void ClangdTestCompletion::testCompleteMembers()
     Manipulator manipulator;
     item->apply(manipulator, cursorPos);
     QCOMPARE(manipulator.getLine(7), "    s.member /* COMPLETE HERE */");
-    QCOMPARE(manipulator.cursorPos(), qMakePair(7, 13));
+    QCOMPARE(manipulator.cursorPos(), qMakePair(7, 12));
     QCOMPARE(manipulator.skipPos(), -1);
 }
 
@@ -1577,7 +1577,7 @@ void ClangdTestCompletion::testCompleteMembersFromInside()
     Manipulator manipulator;
     item->apply(manipulator, cursorPos);
     QCOMPARE(manipulator.getLine(4), "        privateFunc() /* COMPLETE HERE */");
-    QCOMPARE(manipulator.cursorPos(), qMakePair(4, 22));
+    QCOMPARE(manipulator.cursorPos(), qMakePair(4, 21));
     QCOMPARE(manipulator.skipPos(), -1);
 }
 
@@ -1595,7 +1595,7 @@ void ClangdTestCompletion::testCompleteMembersFromOutside()
     Manipulator manipulator;
     item->apply(manipulator, cursorPos);
     QCOMPARE(manipulator.getLine(13), "    c.publicFunc() /* COMPLETE HERE */");
-    QCOMPARE(manipulator.cursorPos(), qMakePair(13, 19));
+    QCOMPARE(manipulator.cursorPos(), qMakePair(13, 18));
     QCOMPARE(manipulator.skipPos(), -1);
 }
 
@@ -1613,7 +1613,7 @@ void ClangdTestCompletion::testCompleteMembersFromFriend()
     Manipulator manipulator;
     item->apply(manipulator, cursorPos);
     QCOMPARE(manipulator.getLine(14), "    C().privateFunc() /* COMPLETE HERE */");
-    QCOMPARE(manipulator.cursorPos(), qMakePair(14, 22));
+    QCOMPARE(manipulator.cursorPos(), qMakePair(14, 21));
     QCOMPARE(manipulator.skipPos(), -1);
 }
 
@@ -1630,7 +1630,7 @@ void ClangdTestCompletion::testFunctionAddress()
     Manipulator manipulator;
     item->apply(manipulator, cursorPos);
     QCOMPARE(manipulator.getLine(7), "    const auto p = &S::memberFunc /* COMPLETE HERE */;");
-    QCOMPARE(manipulator.cursorPos(), qMakePair(7, 34));
+    QCOMPARE(manipulator.cursorPos(), qMakePair(7, 33));
     QCOMPARE(manipulator.skipPos(), -1);
 }
 
@@ -1696,7 +1696,7 @@ void ClangdTestCompletion::testCompleteClassAndConstructor()
     Manipulator manipulator;
     item->apply(manipulator, cursorPos);
     QCOMPARE(manipulator.getLine(7), "    Foo( /* COMPLETE HERE */");
-    QCOMPARE(manipulator.cursorPos(), qMakePair(7, 9));
+    QCOMPARE(manipulator.cursorPos(), qMakePair(7, 8));
     QCOMPARE(manipulator.skipPos(), -1);
 }
 
@@ -1723,7 +1723,7 @@ void ClangdTestCompletion::testCompleteWithDotToArrowCorrection()
     Manipulator manipulator;
     item->apply(manipulator, cursorPos);
     QCOMPARE(manipulator.getLine(4), "    bar->member /* COMPLETE HERE */");
-    QCOMPARE(manipulator.cursorPos(), qMakePair(4, 16));
+    QCOMPARE(manipulator.cursorPos(), qMakePair(4, 15));
     QCOMPARE(manipulator.skipPos(), -1);
 }
 
@@ -1754,7 +1754,7 @@ void ClangdTestCompletion::testCompleteCodeInGeneratedUiFile()
     Manipulator manipulator;
     item->apply(manipulator, cursorPos);
     QCOMPARE(manipulator.getLine(34), "    ui->setupUi( /* COMPLETE HERE */");
-    QCOMPARE(manipulator.cursorPos(), qMakePair(34, 17));
+    QCOMPARE(manipulator.cursorPos(), qMakePair(34, 16));
     QCOMPARE(manipulator.skipPos(), -1);
 }
 
@@ -1882,7 +1882,7 @@ void ClangdTestCompletion::getProposal(const QString &fileName,
     int line, column;
     Text::convertPosition(doc->document(), pos, &line, &column);
     const auto editor = qobject_cast<BaseTextEditor *>(
-        EditorManager::openEditorAt({doc->filePath(), line, column - 1}));
+        EditorManager::openEditorAt({doc->filePath(), line, column}));
     QVERIFY(editor);
     QCOMPARE(EditorManager::currentEditor(), editor);
     QCOMPARE(editor->textDocument(), doc);
diff --git a/src/plugins/cmakeprojectmanager/cmakeeditor.cpp b/src/plugins/cmakeprojectmanager/cmakeeditor.cpp
index 9f507e14808..3411fd85b58 100644
--- a/src/plugins/cmakeprojectmanager/cmakeeditor.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakeeditor.cpp
@@ -147,18 +147,17 @@ void CMakeEditorWidget::findLinkAt(const QTextCursor &cursor,
     int line = 0;
     int column = 0;
     convertPosition(cursor.position(), &line, &column);
-    const int positionInBlock = column - 1;
 
     const QString block = cursor.block().text();
 
     // check if the current position is commented out
     const int hashPos = block.indexOf(QLatin1Char('#'));
-    if (hashPos >= 0 && hashPos < positionInBlock)
+    if (hashPos >= 0 && hashPos < column)
         return processLinkCallback(link);
 
     // find the beginning of a filename
     QString buffer;
-    int beginPos = positionInBlock - 1;
+    int beginPos = column - 1;
     while (beginPos >= 0) {
         if (isValidFileNameChar(block, beginPos)) {
             buffer.prepend(block.at(beginPos));
@@ -169,7 +168,7 @@ void CMakeEditorWidget::findLinkAt(const QTextCursor &cursor,
     }
 
     // find the end of a filename
-    int endPos = positionInBlock;
+    int endPos = column;
     while (endPos < block.count()) {
         if (isValidFileNameChar(block, endPos)) {
             buffer.append(block.at(endPos));
@@ -199,8 +198,8 @@ void CMakeEditorWidget::findLinkAt(const QTextCursor &cursor,
                 return processLinkCallback(link);
         }
         link.targetFilePath = Utils::FilePath::fromString(fileName);
-        link.linkTextStart = cursor.position() - positionInBlock + beginPos + 1;
-        link.linkTextEnd = cursor.position() - positionInBlock + endPos;
+        link.linkTextStart = cursor.position() - column + beginPos + 1;
+        link.linkTextEnd = cursor.position() - column + endPos;
     }
     processLinkCallback(link);
 }
diff --git a/src/plugins/cppeditor/builtincursorinfo.cpp b/src/plugins/cppeditor/builtincursorinfo.cpp
index ffc4d8b12a0..4545ebe748d 100644
--- a/src/plugins/cppeditor/builtincursorinfo.cpp
+++ b/src/plugins/cppeditor/builtincursorinfo.cpp
@@ -322,7 +322,7 @@ QFuture<CursorInfo> BuiltinCursorInfo::run(const CursorInfoParams &cursorInfoPar
     QString expression;
     Scope *scope = canonicalSymbol.getScopeAndExpression(textCursor, &expression);
 
-    return Utils::asyncRun(&FindUses::find, document, snapshot, line, column, scope, expression);
+    return Utils::asyncRun(&FindUses::find, document, snapshot, line, column + 1, scope, expression);
 }
 
 SemanticInfo::LocalUseMap
diff --git a/src/plugins/cppeditor/builtineditordocumentprocessor.cpp b/src/plugins/cppeditor/builtineditordocumentprocessor.cpp
index 4baa2bff341..8e551fd15be 100644
--- a/src/plugins/cppeditor/builtineditordocumentprocessor.cpp
+++ b/src/plugins/cppeditor/builtineditordocumentprocessor.cpp
@@ -92,10 +92,10 @@ CheckSymbols *createHighlighter(const CPlusPlus::Document::Ptr &doc,
     for (const CPlusPlus::Macro &macro : doc->definedMacros()) {
         int line, column;
         convertPosition(textDocument, macro.utf16CharOffset(), &line, &column);
-        QTC_ASSERT(line >= 0 && column >= 0, qDebug() << doc->filePath() << macro.toString();
+        QTC_ASSERT(line > 0 && column >= 0, qDebug() << doc->filePath() << macro.toString();
                    continue);
 
-        Result use(line, column, macro.nameToQString().size(), SemanticHighlighter::MacroUse);
+        Result use(line, column + 1, macro.nameToQString().size(), SemanticHighlighter::MacroUse);
         macroUses.append(use);
     }
 
@@ -119,10 +119,10 @@ CheckSymbols *createHighlighter(const CPlusPlus::Document::Ptr &doc,
 
         int line, column;
         convertPosition(textDocument, macro.utf16charsBegin(), &line, &column);
-        QTC_ASSERT(line >= 0 && column >= 0, qDebug() << doc->filePath()
+        QTC_ASSERT(line > 0 && column >= 0, qDebug() << doc->filePath()
                                                       << macro.macro().toString(); continue);
 
-        Result use(line, column, name.size(), SemanticHighlighter::MacroUse);
+        Result use(line, column + 1, name.size(), SemanticHighlighter::MacroUse);
         macroUses.append(use);
     }
 
diff --git a/src/plugins/cppeditor/cppcanonicalsymbol.cpp b/src/plugins/cppeditor/cppcanonicalsymbol.cpp
index 1df0c71cf96..102a5d07819 100644
--- a/src/plugins/cppeditor/cppcanonicalsymbol.cpp
+++ b/src/plugins/cppeditor/cppcanonicalsymbol.cpp
@@ -51,7 +51,7 @@ Scope *CanonicalSymbol::getScopeAndExpression(const QTextCursor &cursor, QString
 
     ExpressionUnderCursor expressionUnderCursor(m_document->languageFeatures());
     *code = expressionUnderCursor(tc);
-    return m_document->scopeAt(line, column - 1);
+    return m_document->scopeAt(line, column);
 }
 
 Symbol *CanonicalSymbol::operator()(const QTextCursor &cursor)
diff --git a/src/plugins/cppeditor/cppcompletionassist.cpp b/src/plugins/cppeditor/cppcompletionassist.cpp
index e47bee37c44..5466f675eaf 100644
--- a/src/plugins/cppeditor/cppcompletionassist.cpp
+++ b/src/plugins/cppeditor/cppcompletionassist.cpp
@@ -1041,7 +1041,7 @@ int InternalCppCompletionAssistProcessor::startCompletionHelper()
     int line = 0, column = 0;
     Utils::Text::convertPosition(interface()->textDocument(), startOfExpression, &line, &column);
     return startCompletionInternal(interface()->filePath(),
-                                   line, column - 1, expression, endOfExpression);
+                                   line, column, expression, endOfExpression);
 }
 
 bool InternalCppCompletionAssistProcessor::tryObjCCompletion()
@@ -1074,7 +1074,7 @@ bool InternalCppCompletionAssistProcessor::tryObjCCompletion()
     int line = 0, column = 0;
     Utils::Text::convertPosition(interface()->textDocument(), interface()->position(), &line,
                                  &column);
-    Scope *scope = thisDocument->scopeAt(line, column - 1);
+    Scope *scope = thisDocument->scopeAt(line, column);
     if (!scope)
         return false;
 
@@ -1989,7 +1989,7 @@ bool InternalCppCompletionAssistProcessor::completeConstructorOrFunction(const Q
         int lineSigned = 0, columnSigned = 0;
         Utils::Text::convertPosition(interface()->textDocument(), interface()->position(),
                                      &lineSigned, &columnSigned);
-        unsigned line = lineSigned, column = columnSigned - 1;
+        unsigned line = lineSigned, column = columnSigned;
 
         // find a scope that encloses the current location, starting from the lastVisibileSymbol
         // and moving outwards
diff --git a/src/plugins/cppeditor/cppeditoroutline.cpp b/src/plugins/cppeditor/cppeditoroutline.cpp
index 701eea0a76d..a34d2543612 100644
--- a/src/plugins/cppeditor/cppeditoroutline.cpp
+++ b/src/plugins/cppeditor/cppeditoroutline.cpp
@@ -151,7 +151,7 @@ void CppEditorOutline::updateIndexNow()
 
     int line = 0, column = 0;
     m_editorWidget->convertPosition(m_editorWidget->position(), &line, &column);
-    QModelIndex comboIndex = m_model->indexForPosition(line, column - 1);
+    QModelIndex comboIndex = m_model->indexForPosition(line, column);
 
     if (comboIndex.isValid()) {
         QSignalBlocker blocker(m_combo);
diff --git a/src/plugins/cppeditor/cppelementevaluator.cpp b/src/plugins/cppeditor/cppelementevaluator.cpp
index 221c75dd837..27b481cd0c7 100644
--- a/src/plugins/cppeditor/cppelementevaluator.cpp
+++ b/src/plugins/cppeditor/cppelementevaluator.cpp
@@ -562,7 +562,7 @@ public:
         expression = expressionUnderCursor(m_tc);
 
         // Fetch the expression's code
-        *scope = doc->scopeAt(line, column - 1);
+        *scope = doc->scopeAt(line, column);
         return true;
     }
     QFuture<QSharedPointer<CppElement>> syncExec(const CPlusPlus::Snapshot &,
diff --git a/src/plugins/cppeditor/cppfollowsymbolundercursor.cpp b/src/plugins/cppeditor/cppfollowsymbolundercursor.cpp
index d9ac0da2003..0353e16c302 100644
--- a/src/plugins/cppeditor/cppfollowsymbolundercursor.cpp
+++ b/src/plugins/cppeditor/cppfollowsymbolundercursor.cpp
@@ -485,7 +485,6 @@ void FollowSymbolUnderCursor::findLink(
     int line = 0;
     int column = 0;
     Utils::Text::convertPosition(document, cursor.position(), &line, &column);
-    const int positionInBlock = column - 1;
 
     Snapshot snapshot = theSnapshot;
 
@@ -530,7 +529,7 @@ void FollowSymbolUnderCursor::findLink(
     for (int i = 0; i < tokens.size(); ++i) {
         const Token &tk = tokens.at(i);
 
-        if (positionInBlock >= tk.utf16charsBegin() && positionInBlock < tk.utf16charsEnd()) {
+        if (column >= tk.utf16charsBegin() && column < tk.utf16charsEnd()) {
             int closingParenthesisPos = tokens.size();
             if (i >= 2 && tokens.at(i).is(T_IDENTIFIER) && tokens.at(i - 1).is(T_LPAREN)
                 && (tokens.at(i - 2).is(T_SIGNAL) || tokens.at(i - 2).is(T_SLOT))) {
@@ -572,7 +571,7 @@ void FollowSymbolUnderCursor::findLink(
 
             // In this case we want to look at one token before the current position to recognize
             // an operator if the cursor is inside the actual operator: operator[$]
-            if (positionInBlock >= tk.utf16charsBegin() && positionInBlock <= tk.utf16charsEnd()) {
+            if (column >= tk.utf16charsBegin() && column <= tk.utf16charsEnd()) {
                 cursorRegionReached = true;
                 if (tk.is(T_OPERATOR)) {
                     link = attemptDeclDef(cursor, theSnapshot,
@@ -582,7 +581,7 @@ void FollowSymbolUnderCursor::findLink(
                 } else if (tk.isPunctuationOrOperator() && i > 0 && tokens.at(i - 1).is(T_OPERATOR)) {
                     QTextCursor c = cursor;
                     c.movePosition(QTextCursor::Left, QTextCursor::MoveAnchor,
-                                   positionInBlock - tokens.at(i - 1).utf16charsBegin());
+                                   column - tokens.at(i - 1).utf16charsBegin());
                     link = attemptDeclDef(c, theSnapshot, documentFromSemanticInfo, symbolFinder);
                     if (link.hasValidLinkText())
                         return processLinkCallback(link);
@@ -662,7 +661,7 @@ void FollowSymbolUnderCursor::findLink(
     }
 
     // Find the last symbol up to the cursor position
-    Scope *scope = doc->scopeAt(line, positionInBlock);
+    Scope *scope = doc->scopeAt(line, column);
     if (!scope)
         return processLinkCallback(link);
 
@@ -684,7 +683,7 @@ void FollowSymbolUnderCursor::findLink(
             if (Symbol *d = r.declaration()) {
                 if (d->asDeclaration() || d->asFunction()) {
                     if (data.filePath() == d->filePath()) {
-                        if (line == d->line() && positionInBlock >= d->column()) {
+                        if (line == d->line() && column >= d->column()) {
                             // TODO: check the end
                             result = r; // take the symbol under cursor.
                             break;
@@ -697,7 +696,7 @@ void FollowSymbolUnderCursor::findLink(
                                                  &tokenBeginColumnNumber);
                     if (tokenBeginLineNumber > d->line()
                             || (tokenBeginLineNumber == d->line()
-                                && tokenBeginColumnNumber >= d->column())) {
+                                && tokenBeginColumnNumber + 1 >= d->column())) {
                         result = r; // take the symbol under cursor.
                         break;
                     }
diff --git a/src/plugins/cppeditor/cppoutline.cpp b/src/plugins/cppeditor/cppoutline.cpp
index d492ad4fa7e..0d8883f631d 100644
--- a/src/plugins/cppeditor/cppoutline.cpp
+++ b/src/plugins/cppeditor/cppoutline.cpp
@@ -168,7 +168,7 @@ void CppOutlineWidget::updateIndexNow()
 
     int line = 0, column = 0;
     m_editor->convertPosition(m_editor->position(), &line, &column);
-    QModelIndex index = m_model->indexForPosition(line, column - 1);
+    QModelIndex index = m_model->indexForPosition(line, column);
 
     if (index.isValid()) {
         m_blockCursorSync = true;
diff --git a/src/plugins/cppeditor/cppuseselections_test.cpp b/src/plugins/cppeditor/cppuseselections_test.cpp
index f2f13ea55f2..c9c56752844 100644
--- a/src/plugins/cppeditor/cppuseselections_test.cpp
+++ b/src/plugins/cppeditor/cppuseselections_test.cpp
@@ -104,7 +104,7 @@ SelectionList UseSelectionsTestCase::toSelectionList(
         int line, column;
         const int position = qMin(selection.cursor.position(), selection.cursor.anchor());
         m_editorWidget->convertPosition(position, &line, &column);
-        result << Selection(line, column - 1, selection.cursor.selectedText().length());
+        result << Selection(line, column, selection.cursor.selectedText().length());
     }
     return result;
 }
diff --git a/src/plugins/debugger/analyzer/analyzerutils.cpp b/src/plugins/debugger/analyzer/analyzerutils.cpp
index dcfda572cb5..dc87b2ad614 100644
--- a/src/plugins/debugger/analyzer/analyzerutils.cpp
+++ b/src/plugins/debugger/analyzer/analyzerutils.cpp
@@ -52,7 +52,7 @@ CPlusPlus::Symbol *AnalyzerUtils::findSymbolUnderCursor()
     CPlusPlus::ExpressionUnderCursor expressionUnderCursor(doc->languageFeatures());
     moveCursorToEndOfName(&tc);
     const QString &expression = expressionUnderCursor(tc);
-    CPlusPlus::Scope *scope = doc->scopeAt(line, column - 1);
+    CPlusPlus::Scope *scope = doc->scopeAt(line, column);
 
     CPlusPlus::TypeOfExpression typeOfExpression;
     typeOfExpression.init(doc, snapshot);
diff --git a/src/plugins/debugger/debuggertooltipmanager.cpp b/src/plugins/debugger/debuggertooltipmanager.cpp
index 21ed34d5496..4f41436a460 100644
--- a/src/plugins/debugger/debuggertooltipmanager.cpp
+++ b/src/plugins/debugger/debuggertooltipmanager.cpp
@@ -1164,6 +1164,7 @@ void DebuggerToolTipManagerPrivate::slotTooltipOverrideRequested
     context.fileName = document->filePath();
     context.position = pos;
     editorWidget->convertPosition(pos, &context.line, &context.column);
+    ++context.column;
     QString raw = cppExpressionAt(editorWidget, context.position, &context.line, &context.column,
                                   &context.function, &context.scopeFromLine, &context.scopeToLine);
     context.expression = fixCppExpression(raw);
diff --git a/src/plugins/languageclient/languageclientcompletionassist.cpp b/src/plugins/languageclient/languageclientcompletionassist.cpp
index f0b66facc18..c5c86122fcd 100644
--- a/src/plugins/languageclient/languageclientcompletionassist.cpp
+++ b/src/plugins/languageclient/languageclientcompletionassist.cpp
@@ -447,7 +447,6 @@ IAssistProposal *LanguageClientCompletionAssistProcessor::perform()
     if (!Utils::Text::convertPosition(interface()->textDocument(), m_pos, &line, &column))
         return nullptr;
     --line; // line is 0 based in the protocol
-    --column; // column is 0 based in the protocol
     params.setPosition({line, column});
     params.setContext(context);
     params.setTextDocument(
diff --git a/src/plugins/nim/editor/nimcompletionassistprovider.cpp b/src/plugins/nim/editor/nimcompletionassistprovider.cpp
index c94001b348f..f732c45d173 100644
--- a/src/plugins/nim/editor/nimcompletionassistprovider.cpp
+++ b/src/plugins/nim/editor/nimcompletionassistprovider.cpp
@@ -142,8 +142,8 @@ private:
     {
         int line = 0, column = 0;
         Utils::Text::convertPosition(interface->textDocument(), pos, &line, &column);
-        QTC_ASSERT(column >= 1, return nullptr);
-        return suggest->sug(interface->filePath().toString(), line, column - 1, dirtyFile);
+        QTC_ASSERT(column >= 0, return nullptr);
+        return suggest->sug(interface->filePath().toString(), line, column, dirtyFile);
     }
 
     static std::unique_ptr<QTemporaryFile> writeDirtyFile(const TextEditor::AssistInterface *interface)
diff --git a/src/plugins/nim/editor/nimtexteditorwidget.cpp b/src/plugins/nim/editor/nimtexteditorwidget.cpp
index 52bcf64dca4..b297607dced 100644
--- a/src/plugins/nim/editor/nimtexteditorwidget.cpp
+++ b/src/plugins/nim/editor/nimtexteditorwidget.cpp
@@ -50,7 +50,7 @@ void NimTextEditorWidget::findLinkAt(const QTextCursor &c, const Utils::LinkHand
 
     std::shared_ptr<NimSuggestClientRequest> request = suggest->def(path.toString(),
                                                                              line,
-                                                                             column - 1,
+                                                                             column,
                                                                              dirtyFile->fileName());
 
     if (!request)
diff --git a/src/plugins/qmakeprojectmanager/profileeditor.cpp b/src/plugins/qmakeprojectmanager/profileeditor.cpp
index b492112db3d..c17d3d91935 100644
--- a/src/plugins/qmakeprojectmanager/profileeditor.cpp
+++ b/src/plugins/qmakeprojectmanager/profileeditor.cpp
@@ -117,23 +117,22 @@ void ProFileEditorWidget::findLinkAt(const QTextCursor &cursor,
     int line = 0;
     int column = 0;
     convertPosition(cursor.position(), &line, &column);
-    const int positionInBlock = column - 1;
 
     const QString block = cursor.block().text();
 
     // check if the current position is commented out
     const int hashPos = block.indexOf(QLatin1Char('#'));
-    if (hashPos >= 0 && hashPos < positionInBlock)
+    if (hashPos >= 0 && hashPos < column)
         return processLinkCallback(link);
 
     // find the beginning of a filename
     QString buffer;
-    int beginPos = positionInBlock - 1;
-    int endPos = positionInBlock;
+    int beginPos = column - 1;
+    int endPos = column;
 
     // Check is cursor is somewhere on $${PWD}:
-    const int chunkStart = std::max(0, positionInBlock - 7);
-    const int chunkLength = 14 + std::min(0, positionInBlock - 7);
+    const int chunkStart = std::max(0, column - 7);
+    const int chunkLength = 14 + std::min(0, column - 7);
     QString chunk = block.mid(chunkStart, chunkLength);
 
     const QString curlyPwd = "$${PWD}";
@@ -145,7 +144,7 @@ void ProFileEditorWidget::findLinkAt(const QTextCursor &cursor,
     if (posCurlyPwd >= 0) {
         const int end = chunkStart + posCurlyPwd + curlyPwd.count();
         const int start = chunkStart + posCurlyPwd;
-        if (start <= positionInBlock && end >= positionInBlock) {
+        if (start <= column && end >= column) {
             buffer = pwd;
             beginPos = chunkStart + posCurlyPwd - 1;
             endPos = end;
@@ -154,7 +153,7 @@ void ProFileEditorWidget::findLinkAt(const QTextCursor &cursor,
     } else if (posPwd >= 0) {
         const int end = chunkStart + posPwd + pwd.count();
         const int start = chunkStart + posPwd;
-        if (start <= positionInBlock && end >= positionInBlock) {
+        if (start <= column && end >= column) {
             buffer = pwd;
             beginPos = start - 1;
             endPos = end;
@@ -229,8 +228,8 @@ void ProFileEditorWidget::findLinkAt(const QTextCursor &cursor,
         link.targetFilePath = FilePath::fromString(checkForPrfFile(buffer));
     }
     if (!link.targetFilePath.isEmpty()) {
-        link.linkTextStart = cursor.position() - positionInBlock + beginPos + 1;
-        link.linkTextEnd = cursor.position() - positionInBlock + endPos;
+        link.linkTextStart = cursor.position() - column + beginPos + 1;
+        link.linkTextEnd = cursor.position() - column + endPos;
     }
     processLinkCallback(link);
 }
diff --git a/src/plugins/texteditor/texteditor.cpp b/src/plugins/texteditor/texteditor.cpp
index f001756bf90..ecb617aed70 100644
--- a/src/plugins/texteditor/texteditor.cpp
+++ b/src/plugins/texteditor/texteditor.cpp
@@ -3331,7 +3331,7 @@ void TextEditorWidget::restoreState(const QByteArray &state)
 
     d->m_lastCursorChangeWasInteresting = false; // avoid adding last position to history
     // line is 1-based, column is 0-based
-    gotoLine(lineVal, columnVal - 1);
+    gotoLine(lineVal, columnVal);
     verticalScrollBar()->setValue(vval);
     horizontalScrollBar()->setValue(hval);