Navigation to and from the ruler using up and down arrow keys...

... This affects those keys (and NUMPAD arrows), also (shift-)ctrl-f6,
ctrl-home, ctrl-end (which are command-left and right on mac)

Those should be tested to ensure correct restoration of the yellow rectangle,
appropriately in the tracks or the ruler.

This should also be tested with and without the Tracks preference for cyclic
movement of the focus.

src/TrackPanelAx.cpp

@@ -46,12 +46,7 @@ TrackPanelAx::~TrackPanelAx()
 // Returns currently focused track or first one if none focused
 Track *TrackPanelAx::GetFocus()
 {
-   if( !mFocusedTrack )
-   {
-      SetFocus( NULL );
-   }
-
-   if( !TrackNum( mFocusedTrack ) )
+   if( mFocusedTrack && !TrackNum( mFocusedTrack ) )
    {
       mFocusedTrack = NULL;
    }
@@ -72,12 +67,6 @@ void TrackPanelAx::SetFocus( Track *track )
    }
 #endif
 
-   if( track == NULL )
-   {
-      TrackListIterator iter( mTrackPanel->mTracks );
-      track = iter.First();
-   }
-
    mFocusedTrack = track;
 
 #if wxUSE_ACCESSIBILITY
@@ -106,13 +95,8 @@ void TrackPanelAx::SetFocus( Track *track )
 // Returns TRUE if passed track has the focus
 bool TrackPanelAx::IsFocused( Track *track )
 {
-   if( !mFocusedTrack )
-   {
-      SetFocus( NULL );
-   }
-
    if( ( track == mFocusedTrack ) ||
-       ( track == mFocusedTrack->GetLink() ) )
+       ( mFocusedTrack && track == mFocusedTrack->GetLink() ) )
    {
       return true;
    }