STEPS TO REPRODUCE 1. Unlock the task manager 2. Click the hamburger button 3. Drag the "Width" button to make the Task Manager taller EXPECTED RESULTS The Application Launcher and Show Desktop buttons become larger in both dimensions to match the new size ACTUAL RESULTS The Application Launcher and Show Desktop buttons become larger only in one dimension: they become tall and skinny. Screen recording attached. They used to become a bit wider up to a certain point, but the maximum width seems to have changed between 5.9.5 and 5.10.5. This is especially noticeable with a vertical Icons-Only Task Manager that's double the normal width. REPRODUCIBILITY - Reproduces if the aforementioned widgets are moved to another part of the panel. - Reproduces if the task manager is on the bottom, top, or one of the sides. - First seen in Plasma 5.10.5 upon upgrading from Kubuntu 17.04 to 17.10. After upgrading to Plasma 5.11.3 via the Kubuntu backports PPA, the problem persists. - Affects the normal Task Manager as well as the Icons-Only Task Manager. If this is an issue with the affected widgets themselves, I can file new bugs for them, but I figured I'd start here.
Unrelated to the Task Manager widget. Icon-like widgets follow the panel icon size setting from System Settings as ceiling, based on years of user requests to not allow things like the launcher to consume too much real estate.
Heh, figures there's a setting somewhere that controls this. I had set it to 48 before, but it looks like somehow that became reset during the upgrade. Probably a Kubuntu issue. Thanks!