Bug1052: Appearance should change immediately after ctrl-(double-)click...

... for scrubbing.

Now the green play indicator appears, though the play button on the control
toolbar does not go down until the mouse moves.

src/TrackPanel.cpp

@@ -1151,7 +1151,7 @@ void TrackPanel::HandleEscapeKey(bool down)
       return;
 
    auto &scrubber = GetProject()->GetScrubber();
-   if(scrubber.IsScrubbing())
+   if(scrubber.HasStartedScrubbing())
       scrubber.StopScrubbing();
    else switch (mMouseCapture)
    {

src/tracks/ui/PlayIndicatorOverlay.cpp

@@ -17,6 +17,7 @@ Paul Licameli split from TrackPanel.cpp
 #include "../../TrackPanelCell.h"
 #include "../../TrackPanelCellIterator.h"
 #include "../../widgets/Ruler.h"
+#include "Scrubbing.h"
 
 #include <wx/dc.h>
 
@@ -113,8 +114,13 @@ void PlayIndicatorOverlay::OnTimer(wxCommandEvent &event)
    // Let other listeners get the notification
    event.Skip();
 
-   if (!mProject->IsAudioActive())
-      mNewIndicatorX = -1;
+   if (!mProject->IsAudioActive()) {
+      const auto &scrubber = mProject->GetScrubber();
+      if (scrubber.HasStartedScrubbing())
+         mNewIndicatorX = scrubber.GetScrubStartPosition();
+      else
+         mNewIndicatorX = -1;
+   }
    else {
       ViewInfo &viewInfo = mProject->GetViewInfo();
 

src/tracks/ui/Scrubbing.cpp

@@ -302,8 +302,11 @@ void Scrubber::ContinueScrubbing()
 #endif
 }
 
-bool Scrubber::StopScrubbing()
+void Scrubber::StopScrubbing()
 {
+   mScrubStartPosition = -1;
+   mSmoothScrollingScrub = false;
+
    if (IsScrubbing())
    {
       if (gAudioIO->IsBusy()) {

src/tracks/ui/Scrubbing.h

@@ -35,10 +35,17 @@ public:
    // Returns true iff the event should be considered consumed by this:
    bool MaybeStartScrubbing(const wxMouseEvent &event);
    void ContinueScrubbing();
-   bool StopScrubbing();
+   void StopScrubbing();
 
+   wxCoord GetScrubStartPosition() const
+   { return mScrubStartPosition; }
+
+   // True iff the user has clicked to start scrub and not yet stopped,
+   // but IsScrubbing() may yet be false
+   bool HasStartedScrubbing() const
+   { return GetScrubStartPosition() >= 0; }
    bool IsScrubbing() const;
-   bool IsScrollScrubbing() const // If true, implies IsScrubbing()
+   bool IsScrollScrubbing() const // If true, implies HasStartedScrubbing()
    { return mSmoothScrollingScrub; }
 
    bool ShouldDrawScrubSpeed();