8e80a31ba4
The grab stays alive as long as at least one touch point is down. If touch point 0 is lifted while other touch points are down, the surface will jump around when touch point 0 is put down again. This change marks the grab as inactive once touch point 0 is lifted and then ignores touch events until all touch points eventually are lifted and the grab terminates. https://bugs.freedesktop.org/show_bug.cgi?id=73750