diff --git a/src/libs/utils/textutils.cpp b/src/libs/utils/textutils.cpp
index c42f84166fb..0eb16d2dd11 100644
--- a/src/libs/utils/textutils.cpp
+++ b/src/libs/utils/textutils.cpp
@@ -58,6 +58,13 @@ Utils::OptionalLineColumn convertPosition(const QTextDocument *document, int pos
     return optional;
 }
 
+int positionInText(QTextDocument *textDocument, int line, int column)
+{
+    // Deduct 1 from line and column since they are 1-based.
+    // Column should already be converted from UTF-8 byte offset to the TextEditor column.
+    return textDocument->findBlockByNumber(line - 1).position() + column - 1;
+}
+
 QString textAt(QTextCursor tc, int pos, int length)
 {
     if (pos < 0)
diff --git a/src/libs/utils/textutils.h b/src/libs/utils/textutils.h
index f0143165eb7..7c87108832b 100644
--- a/src/libs/utils/textutils.h
+++ b/src/libs/utils/textutils.h
@@ -43,6 +43,9 @@ QTCREATOR_UTILS_EXPORT bool convertPosition(const QTextDocument *document,
 QTCREATOR_UTILS_EXPORT
 Utils::OptionalLineColumn convertPosition(const QTextDocument *document, int pos);
 
+// line and column are 1-based
+QTCREATOR_UTILS_EXPORT int positionInText(QTextDocument *textDocument, int line, int column);
+
 QTCREATOR_UTILS_EXPORT QString textAt(QTextCursor tc, int pos, int length);
 
 QTCREATOR_UTILS_EXPORT QTextCursor selectAt(QTextCursor textCursor, uint line, uint column, uint length);
diff --git a/src/plugins/clangcodemodel/clangdiagnosticmanager.cpp b/src/plugins/clangcodemodel/clangdiagnosticmanager.cpp
index 8f35bee0a44..ce70e36439e 100644
--- a/src/plugins/clangcodemodel/clangdiagnosticmanager.cpp
+++ b/src/plugins/clangcodemodel/clangdiagnosticmanager.cpp
@@ -63,18 +63,6 @@ QTextEdit::ExtraSelection createExtraSelections(const QTextCharFormat &mainforma
     return extraSelection;
 }
 
-int positionInText(QTextDocument *textDocument,
-                   const ClangBackEnd::SourceLocationContainer &sourceLocationContainer)
-{
-    auto textBlock = textDocument->findBlockByNumber(
-                static_cast<int>(sourceLocationContainer.line) - 1);
-    // 'sourceLocationContainer' already has the CppEditor column converted from
-    // the utf8 byte offset from the beginning of the line provided by clang.
-    // - 1 is required for 0-based columns.
-    const int column = static_cast<int>(sourceLocationContainer.column) - 1;
-    return textBlock.position() + column;
-}
-
 void addRangeSelections(const ClangBackEnd::DiagnosticContainer &diagnostic,
                         QTextDocument *textDocument,
                         const QTextCharFormat &contextFormat,
@@ -82,8 +70,13 @@ void addRangeSelections(const ClangBackEnd::DiagnosticContainer &diagnostic,
 {
     for (auto &&range : diagnostic.ranges) {
         QTextCursor cursor(textDocument);
-        cursor.setPosition(positionInText(textDocument, range.start));
-        cursor.setPosition(positionInText(textDocument, range.end), QTextCursor::KeepAnchor);
+        cursor.setPosition(::Utils::Text::positionInText(textDocument,
+                                                         range.start.line,
+                                                         range.start.column));
+        cursor.setPosition(::Utils::Text::positionInText(textDocument,
+                                                         range.end.line,
+                                                         range.end.column),
+                           QTextCursor::KeepAnchor);
 
         auto extraSelection = createExtraSelections(contextFormat, cursor);
 
@@ -127,11 +120,15 @@ QTextCursor createSelectionCursor(QTextDocument *textDocument,
                                   const ClangBackEnd::SourceLocationContainer &sourceLocationContainer)
 {
     QTextCursor cursor(textDocument);
-    cursor.setPosition(positionInText(textDocument, sourceLocationContainer));
+    cursor.setPosition(::Utils::Text::positionInText(textDocument,
+                                                     sourceLocationContainer.line,
+                                                     sourceLocationContainer.column));
     selectToLocationEnd(cursor);
 
     if (!cursor.hasSelection()) {
-        cursor.setPosition(positionInText(textDocument, sourceLocationContainer) - 1);
+        cursor.setPosition(::Utils::Text::positionInText(textDocument,
+                                                         sourceLocationContainer.line,
+                                                         sourceLocationContainer.column) - 1);
         cursor.movePosition(QTextCursor::Right, QTextCursor::KeepAnchor, 2);
     }
 
diff --git a/src/plugins/clangcodemodel/clangeditordocumentprocessor.cpp b/src/plugins/clangcodemodel/clangeditordocumentprocessor.cpp
index 2998fba7c4c..2c6608c6b85 100644
--- a/src/plugins/clangcodemodel/clangeditordocumentprocessor.cpp
+++ b/src/plugins/clangcodemodel/clangeditordocumentprocessor.cpp
@@ -205,20 +205,16 @@ void ClangEditorDocumentProcessor::updateCodeWarnings(
 }
 namespace {
 
-int positionInText(QTextDocument *textDocument,
-                   const ClangBackEnd::SourceLocationContainer &sourceLocationContainer)
-{
-    auto textBlock = textDocument->findBlockByNumber(int(sourceLocationContainer.line) - 1);
-
-    return textBlock.position() + int(sourceLocationContainer.column) - 1;
-}
-
 TextEditor::BlockRange
 toTextEditorBlock(QTextDocument *textDocument,
                   const ClangBackEnd::SourceRangeContainer &sourceRangeContainer)
 {
-    return TextEditor::BlockRange(positionInText(textDocument, sourceRangeContainer.start),
-                                  positionInText(textDocument, sourceRangeContainer.end));
+    return TextEditor::BlockRange(::Utils::Text::positionInText(textDocument,
+                                                                sourceRangeContainer.start.line,
+                                                                sourceRangeContainer.start.column),
+                                  ::Utils::Text::positionInText(textDocument,
+                                                                sourceRangeContainer.end.line,
+                                                                sourceRangeContainer.end.column));
 }
 
 QList<TextEditor::BlockRange>