Allow renaming of FX mixer channels with the F2 and enter keys. (#4348)

* Add f2 as a FX mixer rename shortcut. Enter doesn't work yet.

* Add both enter keys, remove code duplication

* Fix renaming with enter/return

* Clean up

include/FxLine.h

@@ -79,6 +79,10 @@ public:
 
 	static const int FxLineHeight;
 
+	void renameChannel();
+
+	bool eventFilter (QObject *dist, QEvent *event);
+
 private:
 	void drawFxLine( QPainter* p, const FxLine *fxLine, bool isActive, bool sendToThis, bool receiveFromThis );
 	QString elideName( const QString & name );
@@ -98,7 +102,6 @@ private:
 	QGraphicsView * m_view;
 
 private slots:
-	void renameChannel();
 	void renameFinished();
 	void removeChannel();
 	void removeUnusedChannels();

include/FxMixerView.h

@@ -100,6 +100,8 @@ public:
 	void moveChannelLeft(int index, int focusIndex);
 	void moveChannelRight(int index);
 
+	void renameChannel(int index);
+
 	// make sure the display syncs up with the fx mixer.
 	// useful for loading projects
 	void refreshDisplay();