Fix backspace in Visual Studio editor (PR #13100)
IAccessibleHandler.processGenericWinEvent:
Tighten up filtering of MSAA caret events for non-MSAA focus objects to only filter for UIA Word documents, as other UIA documents seem to still depend on these MSAA caret events.
Fixes #13098 - Characters removed with backspace not reported in Visual studio.
Some UIA implementations such as Visual Studio do not fire their own UIA caret events, and therefore actually depend on these MSAA caret events.
