Utils: make column of convertPosition 0-based to merge it into Position

Change-Id: I239b3cb33b8ad59ac4097c919155ab5ca7d57b8e
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

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);