* src/w32fns.c (w32_wnd_proc): Pass the WM_SETTINGCHANGE message
to the Lisp thread.
* src/w32term.c (w32_construct_mouse_wheel): Support mice with
precision scrolling wheel.
(w32_get_mouse_wheel_vertical_delta): New function.
(w32_read_socket): When the WM_SETTINGCHANGE is received, call
'w32_get_mouse_wheel_vertical_delta'.
(w32_initialize): Call 'w32_get_mouse_wheel_vertical_delta' at
startup.
* src/nsterm.m (syms_of_nsterm):
* src/haikuterm.c (syms_of_haikuterm):
* src/xterm.c (syms_of_xterm): Remove window-system specific
variables for coalescing mwheel events.
* src/keyboard.c (syms_of_keyboard)
<mwheel-coalesce-scroll-events>: New variable, to replace the
above platform-specific ones.
* doc/lispref/commands.texi (Misc Events): Improve wording of the
description of mouse-wheel events.
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