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st-button: Ignore pointer emulated touch events

Marco Trevisan requested to merge 3v1n0/gnome-shell:st-ignore-emulated-clicks into master

In X11, pointer emulated touch events are replicated with normal PRESS, RELEASE pair events which are generated by the server. Thus for a single tap we get:

  • TOUCH_BEGIN -> TOUCH_END, PRESS -> RELEASE

This will cause st-button to send two "clicked" signals, instead of just one, breaking extensions (like dash-to-dock) that show buttons in the main stage which will be checked two times or that will receive the same signal two times.

See https://github.com/micheleg/dash-to-dock/issues/805 and https://github.com/micheleg/dash-to-dock/issues/196

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