m_tabletInRange is no longer set for Wintab after 2e81f2c01a
reverted Wintab changes. This reverts most button processing to
behavior present in 2.91.2.
Left in place is a bugfix for Windows Ink: button events while a
Windows Ink pen is in range should still be processed. Events processed
by Windows Ink and not passed to DefWindowProc do not create WM_*BUTTON
events, but button events from e.g. tablet pad express keys do create
WM_*BUTTON events and should be handled.
37afeb7eaa