Global Spacebar Play (#7762)

This PR refactors how the spacebar is handled by the editors and the MainWindow to allow it to play/stop (Shift+Space for play/pause) the last played editor, no matter if it is in focus or not.

---------

Co-authored-by: Fawn <rubiefawn@gmail.com>
Co-authored-by: Sotonye Atemie <satemiej@gmail.com>

include/Editor.h

@@ -57,6 +57,13 @@ protected:
 	DropToolBar * addDropToolBar(QWidget * parent, Qt::ToolBarArea whereToAdd, QString const & windowTitle);
 
 	void closeEvent(QCloseEvent * event) override;
+	void keyPressEvent(QKeyEvent *ke) override;
+public slots:
+	//! Called by pressing the space key. Plays or stops.
+	void togglePlayStop();
+	//! Called by pressing shift+space. Toggles pause state.
+	void togglePause();
+
 protected slots:
 	virtual void play() {}
 	virtual void record() {}
@@ -65,12 +72,6 @@ protected slots:
 	virtual void stop() {}
 
 private slots:
-	/// Called by pressing the space key. Plays or stops.
-	void togglePlayStop();
-	
-	/// Called by pressing shift+space. Toggles pause state.
-	void togglePause();
-
 	void toggleMaximize();
 
 signals:

include/MixerChannelView.h

@@ -61,7 +61,7 @@ public:
 	void contextMenuEvent(QContextMenuEvent*) override;
 	void mousePressEvent(QMouseEvent*) override;
 	void mouseDoubleClickEvent(QMouseEvent*) override;
-	bool eventFilter(QObject* dist, QEvent* event) override;
+	void keyPressEvent(QKeyEvent* ke) override;
 
 	void reset();
 	int channelIndex() const { return m_channelIndex; }

include/Song.h

@@ -257,6 +257,7 @@ public:
 		return m_playMode;
 	}
 
+	PlayMode lastPlayMode() const { return m_lastPlayMode; }
 	inline PlayPos & getPlayPos( PlayMode pm )
 	{
 		return m_playPos[static_cast<std::size_t>(pm)];
@@ -492,6 +493,7 @@ private:
 	std::array<Timeline, PlayModeCount> m_timelines;
 
 	PlayMode m_playMode;
+	PlayMode m_lastPlayMode;
 	PlayPos m_playPos[PlayModeCount];
 	bar_t m_length;