Editor: remove html from default mime data

This is known to be expensive and a lot of users actually prefer plain
text in the copied mime data to avoid unwanted coloring in 3rd party
tools. Add a separate action (Edit > Advanced > Copy With Highlighting)
that preserves the original functionality.

Change-Id: I0f3c529146ab94d0cd9ce9e3b997c8501a577f03
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/texteditor/texteditor.cpp

@@ -6838,6 +6838,13 @@ void TextEditorWidget::copyLine()
     copy();
 }
 
+void TextEditorWidget::copyWithHtml()
+{
+    if (!multiTextCursor().hasSelection())
+        return;
+    QGuiApplication::clipboard()->setMimeData(createMimeDataFromSelection(true));
+}
+
 void TextEditorWidgetPrivate::addCursorsToLineEnds()
 {
     MultiTextCursor multiCursor = q->multiTextCursor();
@@ -7522,6 +7529,11 @@ void TextEditorWidget::switchUtf8bom()
 }
 
 QMimeData *TextEditorWidget::createMimeDataFromSelection() const
+{
+    return createMimeDataFromSelection(false);
+}
+
+QMimeData *TextEditorWidget::createMimeDataFromSelection(bool withHtml) const
 {
     if (multiTextCursor().hasSelection()) {
         auto mimeData = new QMimeData;
@@ -7530,7 +7542,7 @@ QMimeData *TextEditorWidget::createMimeDataFromSelection() const
         mimeData->setText(text);
 
         // Copy the selected text as HTML
-        {
+        if (withHtml) {
             // Create a new document from the selected text document fragment
             auto tempDocument = new QTextDocument;
             QTextCursor tempCursor(tempDocument);