The layer bar Quick Offset was followed and ended in its row's code, and
rows out of view aren't drawn. Released with its row scrolled away, it
stayed active: the next drag of that bar, even a plain one, ran as a
Quick Offset from the old origin, into the old undo step.
Like the key drag, it now follows the pointer below the rows and ends
when the button is released, wherever the bar's row is.
Test: a_quick_offset_released_off_screen_ends (release with the row
scrolled away; a plain drag after it moves both layers together as its
own undo step; fails before).
In After Effects a marquee selection staggers in the comp's layer order,
not in the direction the box was drawn. A Shift-click range of layer
bars and a box of keys already come out top layer first; this test makes
both with the pointer (the range from the bottom layer up, the box from
the bottom right to the top left) and checks the Quick Offset that
follows: the top layer stays and the bottom one moves the whole delta.
Ctrl/Cmd+Alt dragging a selected layer bar or a selected key now runs a
Quick Offset (layer.quickOffset / keys.quickOffset with fromStart, one
undo step). The mode is chosen when the drag starts and needs at least
two unlocked layers; the last selected layer moves by whole frames with
the pointer. A readout by the pointer shows the Total Offset and the
offset Per Layer, translated.
A plain drag still moves the selection together, Alt alone still scales
a key group in time (it now leaves Ctrl/Cmd+Alt to Quick Offset), and
Ctrl/Cmd+Alt+click still toggles Hold. The key drag's readout is drawn
by a shared drag_tip. Keys also register timeline.keyAt.<uid>.<ticks>,
exact where keys on subframes can share a frame.
Tests (ui_quick_offset): staggering layer bars in selection order and
keys per layer, one undo each; plain drags and Alt scaling unchanged; the
readout while dragging.
tylerjenningsw