[StrangePan][2.1.19] Middle click on ANY slot opens the filter UI

[Lemielan]

Only certain types of containers allow filtering on slots, but middle clicking on any kind of slot will open the UI even though selecting something in that UI does nothing. It seems like whatever check should be in place to show or not show the UI is broken and the UI displays for all slots of any kind in any place.

What did I do?
Middle click any slot that does not normally accept a custom filter (e.g. chest inventory, machine input/output).

What happened?
The filter UI appeared. Selecting something does not apply a filter.

What did I expect to happen?
The filter UI should not appear, same as happens in the non-experimental version.

Does it happen always?
Yes.

Examples:
Wooden chest:

09-18-2026, 10-19-15.png (5.73 MiB) Viewed 297 times

Assembling machine 3 input slot:

09-18-2026, 10-20-36.png (5.11 MiB) Viewed 297 times

Assembling machine 3 module slot:

09-18-2026, 10-20-58.png (5.17 MiB) Viewed 297 times

Assembling machine 3 output slot:

09-18-2026, 10-21-18.png (4.61 MiB) Viewed 297 times

Trying to select something in that UI for a slot that already has a filter (e.g. input/module/output) will give an error if you select something that doesn't matching the preset filter, while selecting something compatible will do nothing. For slots that have no filter (like chests) the UI always has no effect.

[StrangePan]

Thank you for the report. This will be fixed in the next release.