CppEditor: Fix highlight of '#' Button for duplication case

Change-Id: Ib97f31912c9b2d619e3b92287ca8b192604f3831
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/cppeditor/cppeditor.cpp

@@ -203,8 +203,7 @@ void CppEditorWidget::finalizeInitialization()
 
     connect(cppEditorDocument(), &CppEditorDocument::preprocessorSettingsChanged, this,
             [this](bool customSettings) {
-        d->m_preprocessorButton->setProperty("highlightWidget", customSettings);
-        d->m_preprocessorButton->update();
+        updateWidgetHighlighting(d->m_preprocessorButton, customSettings);
     });
 
     // set up function declaration - definition link
@@ -267,6 +266,9 @@ void CppEditorWidget::finalizeInitializationAfterDuplication(TextEditorWidget *o
     const Id selectionKind = CodeWarningsSelection;
     setExtraSelections(selectionKind, cppEditorWidget->extraSelections(selectionKind));
 
+    if (isWidgetHighlighted(cppEditorWidget->d->m_preprocessorButton))
+        updateWidgetHighlighting(d->m_preprocessorButton, true);
+
     d->m_parseContextWidget->syncToModel();
     d->m_parseContextAction->setVisible(
                 d->m_cppEditorDocument->parseContextModel().areMultipleAvailable());
@@ -418,6 +420,17 @@ bool CppEditorWidget::selectBlockDown()
     return changed;
 }
 
+void CppEditorWidget::updateWidgetHighlighting(QWidget *widget, bool highlight)
+{
+    widget->setProperty("highlightWidget", highlight);
+    widget->update();
+}
+
+bool CppEditorWidget::isWidgetHighlighted(QWidget *widget)
+{
+    return widget->property("highlightWidget").toBool();
+}
+
 void CppEditorWidget::renameSymbolUnderCursor()
 {
     if (refactoringEngine())

src/plugins/cppeditor/cppeditor.h

@@ -95,6 +95,9 @@ public:
     bool selectBlockUp() override;
     bool selectBlockDown() override;
 
+    static void updateWidgetHighlighting(QWidget *widget, bool highlight);
+    static bool isWidgetHighlighted(QWidget *widget);
+
 protected:
     bool event(QEvent *e) override;
     void contextMenuEvent(QContextMenuEvent *) override;

src/plugins/cppeditor/cppparsecontext.cpp

@@ -25,6 +25,8 @@
 
 #include "cppparsecontext.h"
 
+#include "cppeditor.h"
+
 #include <QAction>
 #include <QDir>
 #include <QDebug>
@@ -165,7 +167,7 @@ void ParseContextWidget::syncToModel()
 
     const bool isPreferred = m_parseContextModel.isCurrentPreferred();
     m_clearPreferredAction->setEnabled(isPreferred);
-    QComboBox::setProperty("highlightWidget", isPreferred);
+    CppEditorWidget::updateWidgetHighlighting(this, isPreferred);
 }
 
 } // namespace Internal