Core: Signal duplicated editors

FakeVim needs some notification even in cases where the
duplication is triggered outside the EditorManager as in
QmlDesigner's qml-editor.

Fixes: QTCREATORBUG-22344
Change-Id: Ia4950ff4b02d3f89779f03ff4c106a07ccff2106
Reviewed-by: Christian Stenger <christian.stenger@qt.io>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/coreplugin/editormanager/ieditor.h

@@ -59,6 +59,9 @@ public:
 
     virtual bool isDesignModePreferred() const { return false; }
 
+signals:
+    void editorDuplicated(IEditor *duplicate);
+
 private:
     bool m_duplicateSupported;
 };

src/plugins/diffeditor/diffeditor.cpp

@@ -286,6 +286,8 @@ Core::IEditor *DiffEditor::duplicate()
     QTC_ASSERT(view, view = editor->currentView());
     editor->setupView(view);
 
+    emit editorDuplicated(editor);
+
     return editor;
 }
 

src/plugins/fakevim/fakevimplugin.cpp

@@ -1551,6 +1551,14 @@ void FakeVimPluginPrivate::editorOpened(IEditor *editor)
     else
         return;
 
+    // Duplicated editors are not signalled by the EditorManager. Track them nevertheless.
+    connect(editor, &IEditor::editorDuplicated, this, [this, editor](IEditor *duplicate) {
+        editorOpened(duplicate);
+        connect(duplicate, &QObject::destroyed, this, [this, duplicate] {
+            m_editorToHandler.remove(duplicate);
+        });
+    });
+
     auto tew = TextEditorWidget::fromEditor(editor);
 
     //qDebug() << "OPENING: " << editor << editor->widget()

src/plugins/imageviewer/imageviewer.cpp

@@ -189,6 +189,9 @@ Core::IEditor *ImageViewer::duplicate()
     other->d->imageView->createScene();
     other->updateToolButtons();
     other->d->ui_toolbar.labelImageSize->setText(d->ui_toolbar.labelImageSize->text());
+
+    emit editorDuplicated(other);
+
     return other;
 }
 

src/plugins/texteditor/texteditor.cpp

@@ -8869,8 +8869,11 @@ BaseTextEditor *TextEditorFactoryPrivate::createEditorHelper(const TextDocumentP
 IEditor *BaseTextEditor::duplicate()
 {
     // Use new standard setup if that's available.
-    if (d->m_origin)
-        return d->m_origin->duplicateTextEditor(this);
+    if (d->m_origin) {
+        IEditor *dup = d->m_origin->duplicateTextEditor(this);
+        emit editorDuplicated(dup);
+        return dup;
+    }
 
     // If neither is sufficient, you need to implement 'YourEditor::duplicate'.
     QTC_CHECK(false);