I think that this may be related to wxWidgets.
I saw this behaviour, for eg, with pyshell from wxPython.
And to be more specific, I think that the problem is with wxListCtrl
Not sure, but I guess that all wx apps that use ListCtrl will have this issue.
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Attached.
I made 2 simple samples,
one in c++ (minimal.cpp) to be used with wxWidgets
the other with python (minimal.py) to be used with wxPython
Both have some directives to be change:
USE_MENUS 1 // 1 - with menus 0 - without menus
USE_LISTCTRL 1// 1 - with a listctrl 0 - wi
I found that the culprit is this patch:
http://launchpadlibrarian.net/64734089/wxwidgets2.8_2.8.11.0-0ubuntu6_2.8.11.0-0ubuntu7.diff.gz
Probably this bug should go to wxwidgets2.8 and/or appmenu-gtk
When run:
UBUNTU_MENUPROXY=0 ./minimal
There is no CPU usage problem with the problematics USE_ME
