VCS: Consolidate submit editor actions setup

Change-Id: I36754779b6a9aa35de705b368daf8c2a1de058c6
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/vcsbase/vcsbaseplugin.h

@@ -177,9 +177,12 @@ public:
                                                     QTextCodec *outputCodec = nullptr,
                                                     const QProcessEnvironment &env = QProcessEnvironment());
 
-protected:
-    // Display name of the commit action:
+    // Display name of the commit action
     virtual QString commitDisplayName() const;
+
+    virtual void commitFromEditor() = 0;
+
+protected:
     // Prompt to save all files before commit:
     bool promptBeforeCommit();