You can't multi-drag-select an even number of items in a group

[DNin01]

There's a bug where if you are drag-selecting while holding shift and you select a group, that group does not get selected if the selection area covered an even number of items. Instead, you have to shift-click the group.

Expected Behavior

The group should always be selected or deselected.

Actual Behavior

The group is only selected or deselected if while holding shift you drag-select an odd number of items that are part the group.

This is probably because for every group item selected, Scratch doesn't consider if they are in a group, and then goes on to treat each item individually as if they were not grouped. Scratch selects or deselects that group as many times as items in it were selected. If there are say, four items from a group that were in the selection area, Scratch does this four times - selecting, then deselecting, and then selecting again, and finally deselecting again.

System Details

Windows 10
Scratch app version 3.27.0
Microsoft Edge version 103
Mouse and keyboard

Demonstration

2022-07-12.15-04-56.mp4

[cwillisf]

Wow, thanks for the detailed and insightful report! Such a weird bug :D

[adroitwhiz]

This is similar to #567, and a similar fix may work?