Improve focus change for modal dialogs in xfwm4


(Old svn revision: 11332)

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Change default background color to #336699 and update screen captures for doc (default WM decorations are rounded)


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- Automatically above/normal layer switch added for older legacy apps trying to achieve fullscreen mode.
- Focus won't go to windows from another desktop on MapRequest event
- Fix very rare freeze under high load when double clicking on menu button
- Support update of wm_protocol properties for apps that set it after window mapping.


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Don't kill the client application (ala xkill) when right clicking on the close [X] button anymore (ie read "I remove that hidden feature" as it's too dangerous, the application has no chance to recover or prompt the user for unsaved data for example)


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Don't test WM_PROTOCOLS_DELETE_WINDOW when closing client (as some client don't set this flag, they get killed while they do support "wm_delete_window" message.


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Remove auto unhide feature because it causes problems with some apps (Lotus Notes R5 under Wine being an example)


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Blender sets only 4 elements in MWM hints intead of 5 as defined, as we ignore the fifth element anyway, read only 4 elements and make blender happy...


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Remove the "stashEventTime()" and "getEventTime()" functions as it causes more trouble than it fixes.


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