Two separate faults, both only reachable with a second finger.
The gesture never arrived. `ScaleRotateGestureHandler` was sized `100%`
inside the Flickable, which is the Flickable's own height, not its
viewport's — so the handler was one screenful tall at the top of a
viewport thousands of rows long. A pinch is delivered to whatever lies
under the midpoint of the two fingers, so it landed on the handler only
while the grid was scrolled to the very top and found nothing anywhere
else. Sized to `viewport-height` now, exactly as `zoom-catcher` above it
already is.
And the attempt opened a photograph. When a second finger lands Slint
closes the first one's gesture by synthesising a `Released` at its
position — that is how a Flickable is persuaded to let go of a scroll it
has already claimed. A TouchArea cannot tell that release from a real one
and fires `clicked`, so every pinch opened whichever image the first
finger was resting on.
The finger id separates them: the synthetic release carries the id of the
finger that *arrived*, never the one that pressed. `clicked` fires before
the pointer event that names the finger, so it now only raises a flag and
the `up` handler decides. A mouse reports 0 for both, leaving the desktop
path exactly as it was.
dtourolle
4d8196174c
