ProjectWindow does not depend on selection toolbars...

... Freeing SelectionBar and SpectralSelectionBar from cycles.

Also fixing a minor problem:  if two projects are open, and one is playing or
recording, and you switch windows -- then the audio time in the selection bar
of the other project could be updated.

src/toolbars/SelectionBar.cpp

@@ -56,8 +56,11 @@ with changes in the SelectionBar.
 #include "../AColor.h"
 #include "../KeyboardCapture.h"
 #include "../Prefs.h"
+#include "../Project.h"
+#include "../ProjectAudioIO.h"
 #include "../ProjectSettings.h"
 #include "../Snap.h"
+#include "../ViewInfo.h"
 #include "../AllThemeResources.h"
 
 #if wxUSE_ACCESSIBILITY
@@ -96,6 +99,7 @@ BEGIN_EVENT_TABLE(SelectionBar, ToolBar)
    EVT_TEXT(EndTimeID, SelectionBar::OnChangedTime)
    EVT_CHOICE(SnapToID, SelectionBar::OnSnapTo)
    EVT_CHOICE(ChoiceID, SelectionBar::OnChoice )
+   EVT_IDLE( SelectionBar::OnIdle )
    EVT_COMBOBOX(RateID, SelectionBar::OnRate)
    EVT_TEXT(RateID, SelectionBar::OnRate)
 
@@ -578,6 +582,27 @@ void SelectionBar::OnChoice(wxCommandEvent & WXUNUSED(event))
    SelectionModeUpdated();
 }
 
+void SelectionBar::OnIdle( wxIdleEvent &evt )
+{
+   evt.Skip();
+   auto &project = mProject;
+   const auto &selectedRegion = ViewInfo::Get( project ).selectedRegion;
+
+   double audioTime;
+
+   auto &projectAudioIO = ProjectAudioIO::Get( project );
+   if ( projectAudioIO.IsAudioActive() ){
+      auto gAudioIO = AudioIOBase::Get();
+      audioTime = gAudioIO->GetStreamTime();
+   }
+   else {
+      const auto &playRegion = ViewInfo::Get( project ).playRegion;
+      audioTime = playRegion.GetStart();
+   }
+
+   SetTimes(selectedRegion.t0(), selectedRegion.t1(), audioTime);
+}
+
 void SelectionBar::SelectionModeUpdated()
 {
    // We just changed the mode.  Remember it.

src/toolbars/SelectionBar.h

@@ -79,6 +79,7 @@ class SelectionBar final : public ToolBar {
    void OnFocus(wxFocusEvent &event);
    void OnCaptureKey(wxCommandEvent &event);
    void OnSize(wxSizeEvent &evt);
+   void OnIdle( wxIdleEvent &evt );
 
    void ModifySelection(int newDriver, bool done = false);
    void UpdateRates();

src/toolbars/SpectralSelectionBar.cpp

@@ -55,8 +55,10 @@ with changes in the SpectralSelectionBar.
 #include <wx/statline.h>
 
 #include "../Prefs.h"
+#include "../Project.h"
 #include "../AllThemeResources.h"
 #include "../SelectedRegion.h"
+#include "../ViewInfo.h"
 
 #if wxUSE_ACCESSIBILITY
 #include "../widgets/WindowAccessible.h"
@@ -86,6 +88,7 @@ BEGIN_EVENT_TABLE(SpectralSelectionBar, ToolBar)
    EVT_CHOICE(OnChoiceID, SpectralSelectionBar::OnChoice)
    EVT_COMMAND(wxID_ANY, EVT_FREQUENCYTEXTCTRL_UPDATED, SpectralSelectionBar::OnUpdate)
    EVT_COMMAND(wxID_ANY, EVT_BANDWIDTHTEXTCTRL_UPDATED, SpectralSelectionBar::OnUpdate)
+   EVT_IDLE( SpectralSelectionBar::OnIdle )
 END_EVENT_TABLE()
 
 static const wxString preferencePath
@@ -369,6 +372,14 @@ void SpectralSelectionBar::OnChoice(wxCommandEvent &)
    Updated();
 }
 
+void SpectralSelectionBar::OnIdle( wxIdleEvent &evt )
+{
+   evt.Skip();
+   auto &project = mProject;
+   const auto &selectedRegion = ViewInfo::Get( project ).selectedRegion;
+   SetFrequencies( selectedRegion.f0(), selectedRegion.f1() );
+}
+
 void SpectralSelectionBar::OnUpdate(wxCommandEvent &evt)
 {
    int index = evt.GetInt();

src/toolbars/SpectralSelectionBar.h

@@ -56,6 +56,7 @@ private:
    void OnUpdate(wxCommandEvent &evt);
    void OnCtrl(wxCommandEvent &evt);
    void OnChoice(wxCommandEvent &evt);
+   void OnIdle( wxIdleEvent &evt );
 
    void OnSize(wxSizeEvent &evt);