VCS: raise submit editor to the front when prompting

Bring the submit to the front when asking whether the change should
get committed or not. This is useful when e.g. closing creator
while a submiteditor is open somewhere (but not visible).

src/plugins/vcsbase/vcsbasesubmiteditor.cpp

@@ -466,6 +466,8 @@ VCSBaseSubmitEditor::PromptSubmitResult
                                           bool *promptSetting,
                                           bool forcePrompt) const
 {
+    raiseSubmitEditor();
+
     QString errorMessage;
     QMessageBox::StandardButton answer = QMessageBox::Yes;