When recently testing fullscreen on High Sierra I found another issue. From the main window of my app a Setup window can be opened. This has an ugly black frame around it:
When clicking on another item on the toolbar the window only shows the toolbar but not the window part. The window has fullscreen off but resizable on. If I set resizable to off the odd effect goes away. Unfortunately, I can’t reproduce this in a simple example. Has anyone else seen this?
Both Maximise and Fullsize button were set to off. But as soon as I set Resizable to true those settings don’t seem to matter anymore on High Sierra. MaxWidth and MaxHeight were set to 1000. The screen of the MacBook Air is 1440x900 so I changed the MaxHeight to 800. But this didn’t make a difference.
What is also a useability problem is that the window should have 2 different sizes for different selections of toolbar. When the black frame is visible the size of the window doesn’t change.