[PATCH] systray icon

[Jehan Bing]

Hello everybody,

Here is another patch which adds the "-systray" option. With this option 
on, instead of adding buttons to the taskbar, it adds icons to the 
notification area (a.k.a. systray).
To work, there must be a "X.ico" (see attachment) in the same directory 
than XWin.exe

Left click on the icon shows the window if it was hidden, hide it otherwise.
Right click displays the system menu (there isn't one in fullscreen)

Notes:
    - I added a file (winsystray.c) so "make depend" is in order.
    - The patch also changes the title to include the screen number. To 
get the screen number, I'm searching the g_ScreenInfo array. I'm sure 
there must be a better way to get this number (search for "HACK", there 
are 3 places).
    - The option doesn't work well in fullscreen mode. For some reason, 
when one click on the systray icon, the application isn't activated 
(doesn't switch to fullscreen, no WM_ACTIVATEAPP received) but the 
application still captures the mouse event, it's as if the desktop 
doesn't respond anymore. For those who try and/or want to fix it (I 
don't have the beginning of an idea for that so help is welcome), to 
recover from the "freeze", open the start menu with the "Windows" key, 
then click outside the menu.
    - I fixed a couple typos (CYGDEGUG and missing '\n' for 
"-lesspointer" usage)
    - X.ico would be better off added as a resource to the application 
instead of an external file (or both if we want to allow customization). 
Can we do that with cygwin?
    - An improvment would be to add the screen number to the icon 
itself. It would be better than waiting for the tooltip.
    - I would like to change the left click behavior. I want it to put 
the window to the foreground if it was not (hidden behind another 
window), hide it otherwise. However, when one click on the systray, the 
systray become the foreground window. Does someone know how to get the 
handle of the previous foreground window?

    Jehan
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