Window minimized bounds bug?

I don’t disagree. A case should definitely be logged to make Xojo aware of the problem and the current behaviour should be documented.

I fill a bug report from my PC: #71304
As I explain in it at the end, I can’t add my project when I’m under PC, I don’t remember have trouble to add them when I fill a bug report from my Mac.

Don’t hesitate to use comments for that, even at multiple places. Just putting “//Workaround for a bug” may be sufficient.

On my Mac I noticed that the Focus property was set to Nil, when Minimized.
When Restored the Focus is set to a control again. But this focused control needs to be checked if it is a child of the restored window.

But this all is true when the window has focus-able controls. If the window is empty, or the window doesn’t have controls that can focus, the Focus property might not be set.