Problem: A user can tab to the list, and none of the items is the focus. The list itself is still the focus. As a result, there is no visual indication of the focus, and an additional keystroke is needed to make any item the focus.
Fix: When the list gains focus, if no items are selected, select the first item, if there is one.
Problem:
Using the Narrator screen reader on Windows 10:
1. Narrator does not read the uneditable cells in the tag column of the Metadata editor.
2. In one or more versions of Windows 10 prior to 1809, Narrator's focus was incorrect after editing a cell.
Fixes:
1. Fixed by adding wxACC_STATE_SYSTEM_FOCUSED to the state.
2. Corrected GridAx::GetFocus().
... as was the intention in the wxWidgets code from which these files were
adapted
More importantly this removes the mischievous #define (added at 08c94d5) from
valnum.h, which made it impossible to #include that header before
<wx/combobox.h>.
Note that (the real type) wxTextEntry is not a kind of wxWindow, but a class
from which wxTextCtrl and wxComboBox both inherit, while they inherit wxWindow
too along other paths.
So in some places, use the protected variable m_ValidatorWindow instead to
access the validator's window.
Problem:
Using the Narrator screen reader on Windows 10, there are a couple of problems:
1. When using the left/right arrow keys, Narrator reads the current field, rather than the digit which is now the focus.
2. Using up/down arrow keys, Narrator is silent.
Fixes:
1. The existing code assumes that NumericTextCtrlAx::GetName() is called only once after left/right arrow is pressed. However, Narrator causes this function to be called more than once. Solution: handle the case where the function is called, and neither the focus or the digits have changed, and use a cached value of the name.
2. If the focus has not changed, then after a focus event, Narrator does not read the name, even if the name has changed. Solution: add a name change event. (The focus event has been retained to keep Window-Eyes happy until we stop supporting it.)
Note:
One of the focus events has been removed from NumericTextCtrl::SetFieldFocus(), as it no longer appears to be necessary.
... except Audacity.h
This forces us to make each header contain all forward declarations or nested
headers that it requires, rather than depend on context.
... except Audacity.h; and in no others.
Do so even if Experimental.h gets multiply included, as in both the .h and
.cpp files.
This makes it easier to do a text scan to be sure there are no unintended quiet
changes of meaning because of omission of Experimental.h when the flag is
an enabled one.
Also move inclusions of Experimental.h earlier.
Also don't require Experimental.h to be preceded by Audacity.h to define
EXPERIMENTAL_MIDI_OUT correctly.
