... There was no reason to store the help location preferences as per-project
state. Also move the dialog for quick fixes near its only use in
HelpMenus.cpp.
This takes 22 files out of the big strongly connected component, notably
the much used lower level utilities, ErrorDialog and AudacityException.
HelpSystem itself is still in a small cycle with LinkingHtmlWindow.
... when special initial population of preferences is lifted into
AudacityApp.cpp.
This takes four files out of the big strongly connected component of the graph
into low levels, but three of them (Prefs, Languages, FileNames) are still in
a small cycle. FileHistory is the fourth, depending on the others.
... and break its compile dependency on CommandManager.h by letting it install
callbacks.
This also removes Objective-C mixed code from CommmandManager.
This also eliminates four inclusions of Project.h!
Capture handler state is also global, not per project, though the
CommandManager's callbacks still do depend on the active project.
Problem: this affects NVDA and Narrator, but not Jaws. If a user moves to the Delete button and presses it to delete a label, a label is incorrectly read as the new focus - the focus remains on the Delete button.
GridAx::SetCurrentCell() can be called when the Grid is not the focus, and send a focus event.
Fix: In GridAx::SetCurrentCell() only send an focus event if the Grid is the focus.
Problem: If the initial focus is a control in a toolbar, then after applying an effect such as amplify, then the focus is read as being a track, not the control in the toolbar.
TrackPanelAx::SetFocus() can be called when the TrackPanel is not the focus, and send a focus event.
Fix: In TrackPanelAx::SetFocus(), only send a focus event if the TrackPanel is the focus.
Problem. If an item in the list is selected, then if a different view by radio button is selected, Narrator reads the selected item rather than the radio button.
KeyViewAx::SetCurrentLine(int line) can be called when the KeyView is not the focus, and send a focus event.
Fix: In KeyViewAx::SetCurrentLine(int line), only send focus event if the KeyView is the focus.
... Unnecessary because transitively included.
But each .cpp file still includes its own .h file near the top to ensure
that it compiles indenendently, even if it is reincluded transitively later.
... Identifier holds strings used for internal purposes and not shown to users;
TaggedIdentifier generates subclasses of Identifier for different purposes,
which won't implicitly (that is, inadvertently) interconvert as function
arguments.
