Regression caused by 03f17c42d0
In that commit it was assumed that the hotkey modifier `S` had no
influence if we were already resizing.
But this is not the case in tracking. The second `S` has influence and
should not be filtered.
The solution is to add a conditional only to Trackers transformation.
This commit also fixed the canceling of this transformation which did
not revert the search area to its original value.
04a07d5e08