Clang: fix incomplete include text underlining

Fix invalid include text selection.

Task-number: QTCREATORBUG-15471
Change-Id: Ifbe00a7215f2307648e815cb283691496d02c4d0
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/clangcodemodel/clangdiagnosticmanager.cpp

@@ -81,12 +81,44 @@ void addRangeSelections(const ClangBackEnd::DiagnosticContainer &diagnostic,
     }
 }
 
+QChar selectionEndChar(const QChar startSymbol)
+{
+    if (startSymbol == '"')
+        return QLatin1Char('"');
+    if (startSymbol == '<')
+        return QLatin1Char('>');
+    return QChar();
+}
+
+void selectToLocationEnd(QTextCursor &cursor)
+{
+    const QTextBlock textBlock = cursor.document()->findBlock(cursor.position());
+    const QString simplifiedStr = textBlock.text().simplified();
+    if (!simplifiedStr.startsWith("#include") && !simplifiedStr.startsWith("# include")) {
+        // General case, not the line with #include
+        cursor.movePosition(QTextCursor::EndOfWord, QTextCursor::KeepAnchor);
+        return;
+    }
+
+    const QChar endChar = selectionEndChar(cursor.document()->characterAt(cursor.position()));
+    if (endChar.isNull()) {
+        cursor.movePosition(QTextCursor::EndOfWord, QTextCursor::KeepAnchor);
+    } else {
+        const int endPosition = textBlock.text().indexOf(endChar, cursor.position()
+                                                         - textBlock.position() + 1);
+        if (endPosition >= 0)
+            cursor.setPosition(textBlock.position() + endPosition + 1, QTextCursor::KeepAnchor);
+        else
+            cursor.movePosition(QTextCursor::EndOfLine, QTextCursor::KeepAnchor);
+    }
+}
+
 QTextCursor createSelectionCursor(QTextDocument *textDocument,
                                   const ClangBackEnd::SourceLocationContainer &sourceLocationContainer)
 {
     QTextCursor cursor(textDocument);
     cursor.setPosition(positionInText(textDocument, sourceLocationContainer));
-    cursor.movePosition(QTextCursor::EndOfWord, QTextCursor::KeepAnchor);
+    selectToLocationEnd(cursor);
 
     if (!cursor.hasSelection()) {
         cursor.setPosition(positionInText(textDocument, sourceLocationContainer) - 1);