Non-modal menus

My goal was to solve the problem of when the user has one menu open clicking to open another menu closes the current menu instead of opening the new one. This is because all temporary regions are modal. This patch removes the modality of temporary regions and fixes some problems associated with scrolling and input for the newly non-modal regions.

Here's the result: http://www.youtube.com/watch?v=mY_e1gbfZt0

The previous solution for color pickers was to make the menu close when the mouse hovered over another button. I think this is only addresses the symptom of the real problem. If the color picker were non-modal then the mouse would be able to click other buttons with the color picker open.

I recognize this code is experimental so I'd like some help in identifying problems that may be created by it.

[brechtvl, 2012-06-03 10:20:59]

This patch seems to break text input, numbers get typed twice, and if I press
e.g. G key while my mouse cursor is over a 3d view, it starts transform.

[Vino, 2012-06-03 17:54:05]

Thank you for reviewing! Bugs to fix, sounds fun. New patch on the way.

[Vino, 2012-06-05 23:59:08]

On 2012/06/05 23:30:09, Vino wrote:

Bugs are now fixed. Text areas should behave normally.

[brechtvl, 2012-06-06 12:51:39]

http://codereview.appspot.com/6279046/diff/5001/source/blender/editors/interf...
File source/blender/editors/interface/interface_handlers.c (right):

http://codereview.appspot.com/6279046/diff/5001/source/blender/editors/interf...
source/blender/editors/interface/interface_handlers.c:6562:
ui_handle_button_event(C, event, but);
With this call to ui_handle_button_event the retval is ignored, but a few lines
later it is used? An event like a key press or mouse click should only be
handled exactly once, and that does not seem to be assured here.

[Vino, 2012-06-12 06:50:56]

Okay, the retval is in now. I studied the code to figure out what the proper
line should be, and I'm pretty satisfied with this. I did a good bit of testing
and it doesn't seem to have any effect either way on any features I can find.