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Add option to set gestures in auto-competition mode. It will draw gesture at the screen at mouse position. When user don't paint this gesture, it will search most matched gesture.

Once user release mouse key and don't paint any gesture, button do this action should appear. It will auto-complete gesture and perform action with match to what user drew on the screen.

Topic was bad.

The topic should be: [Gestures] Auto-completition mode.

I'm the guy who made the last big changes to the gesture recognition code (back in KDE 4.3 times :/ ) so I feel qualified to point out why this is unlikely to happen in the foreseeable future.

If I understand your proposition correctly it would require us to be able to compare partial gestures - for example to recognize that a user intends to draw an 'L' shape when he's only drawn the beginning of it, for example an 'I' or a '_' shape.

If so: Unfortunately the algorithm doesn't work like that, it can only compare complete gestures. That's why it's able to recognize gestures even if they're drawn in a different size or with differing mouse speed.
A workaround like comparing against (many!) subsets of the possible gestures would almost certainly be much too slow, especially considering that it would have to be done continuously (while drawing the gesture) instead of once at the end.

So, barring someone finding a new gesture recognition algorithm that solves this problem (and I don't think it's possible without sacrificing other qualities) this probably wouldn't work decently.

Technical issues aside, if a gesture takes a second to draw it's a damn long one. I'm not sure looking at previews takes less time than just drawing the gesture to the end.