Keyframe synchronization + Selected kf ui + NewKeyframe Crash patch
synchro of selected keyframe between dock & timeline.
part of : http://www.synfig.org/issues/thebuggenie/synfig/issues/458
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selected keyframe user interface distinction (see forum http://www.synfig.org/forums/viewtopic.php?f=14&t=2962#p20246)
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newkeyframe crash patch : get_window test (see forum http://www.synfig.org/forums/viewtopic.php?f=15&t=4305#p20278 )
Keyframe synchro - deadloop progress :
has_focus() test on  KeyframeTree::on_selection_changed()
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selected_kf = keyframe; before signal emission
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some debug message
Keyframe synchro - deadloop progress 2

No more on_selection_changed signal
Welcome to on_cursor_changed signal
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More debug message

Deadloop happen when playing a while moving kf first to last between keyframe tree and keyframe widget
Deadloop : unless loop selection of existing keyframe to segfault