Editor: Set tabsettings on new generic highlighter.

Task-number: QTCREATORBUG-12172
Change-Id: I5194da0f6c8c1c453906c9752fc2fdf0e8b0b1be
Reviewed-by: Christian Stenger <christian.stenger@digia.com>

src/plugins/texteditor/plaintexteditor.cpp

@@ -133,6 +133,7 @@ void PlainTextEditorWidget::configure(const QString &mimeType)
 void PlainTextEditorWidget::configure(const MimeType &mimeType)
 {
     Highlighter *highlighter = new Highlighter();
+    highlighter->setTabSettings(baseTextDocument()->tabSettings());
     baseTextDocument()->setSyntaxHighlighter(highlighter);
 
     setCodeFoldingSupported(false);