Fixes: Add a combo for diff file browsing, bring diff editors to front, exclude qconfig.pri from files examined by p4.

Task: 234842

src/plugins/vcsbase/diffhighlighter.h

@@ -79,6 +79,8 @@ public:
     // Set formats from a sequence of type QTextCharFormat
     void setFormats(const QVector<QTextCharFormat> &s);
 
+    QRegExp filePattern() const;
+
 private:
     DiffHighlighterPrivate *m_d;
 };