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Fix click to select for tablets

Diego Gangl requested to merge diegogangl/pitivi:fix_digitizer_drag into master

Left clicking in Digitizer tablets (Wacom, Huion, etc.) is done by tapping the pad with the stylus. However since the stylus is entirely in the user's hand it is in constant movement due to pulse, involuntary movements, etc. This means that after press down the cursor will always move, which will be registered as a drag.

To fix this we set a tolerance of 3 pixels, so we can tell if the user really wants to start dragging.

fixes #2319 (closed)

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