Fix for bug #3073481, in MouseLeave set ptMouseLast to (-1,-1) so will not send dwell start on timer. Send dwell end for mouse leave.
Fix for bug #3073481, in MouseLeave set ptMouseLast to (-1,-1) so will not send
dwell start on timer. Send dwell end for mouse leave.

timonwong/foo_uie_wsh_panel_mod.scintilla,timonwong/foo_uie_wsh_panel_mod.scintilla,timonwong/foo_uie_wsh_panel_mod.scintilla,timonwong/foo_uie_wsh_panel_mod.scintilla,timonwong/foo_uie_wsh_panel_mod.scintilla,timonwong/foo_uie_wsh_panel_mod.scintilla,timonwong/foo_uie_wsh_panel_mod.scintilla,timonwong/foo_uie_wsh_panel_mod.scintilla