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(syms_of_w32term): DEFVAR_BOOL and initialize it.
(note_mouse_movement): Use it.

* w32term.c (x_check_fullscreen, x_check_fullscreen_move)
(x_fullscreen_adjust): New functions.
(w32_read_socket) <WM_WINDOWPOSCHANGED>:  Don't	resize to
fullscreen.  Call x_check_fullscreen_move, and set the
want_fullscreen member of output_data.w32
<WM_ACTIVATE, WM_ACTIVATEAPP>: Call x_check_fullscreen.