Created attachment 152749 [details] screenshot of the issue, on the left is 5.26 sizing, on the right is 5.25 STEPS TO REPRODUCE 1. Get a third party plasmoid that doesn't set implicitWidth and implicitHeight (e.g. weather-applet) 2. Update to plasma 5.26 3. Click to expand OBSERVED RESULT Completely wrong sizing (see screenshot) EXPECTED RESULT Correct sizing as with 5.25 (implicitWidth = width) Operating System: Fedora Linux 36 KDE Plasma Version: 5.26.0 KDE Frameworks Version: 5.99.0 Qt Version: 5.15.6 Kernel Version: 5.19.14-200.fc36.x86_64 (64-bit) Graphics Platform: X11 Processors: 12 × AMD Ryzen 5 5600X 6-Core Processor Memory: 31.3 GiB of RAM Graphics Processor: NVIDIA GeForce RTX 3070/PCIe/SSE2 System Version: 1.0 Additional Information: the plasmoid doesn't offer resizing as others do with 5.26, but even if manually resized (via the alt+mouseButton shortcut) the custom size is lost after a plasma restart.
Thanks for reporting this. It appears to be caused by the work to make popups resizable; we became more strict about setting correct size properties as a by-product of the work. How sure how we could go back without breaking the resize functionality as currently implemented...
*** Bug 460338 has been marked as a duplicate of this bug. ***
I think unfortunately we have to call this one intentional, as we can't change it without breaking the popup resizability feature. Ideally we would have made such a change for Plasma 6, but that ship has already sailed. I will work on a communication to 3rd-party widget authors.
*** Bug 461171 has been marked as a duplicate of this bug. ***