Ability to set inner window size

[pcolton]

Feature Request Description

I'd like to set a window's internal size specifically, without having to know the size of the borders and title bar (i.e. the window size is a bit bigger than my specified size to encompass the borders and title bar.)

Screenshots

No response

Additional Context

No response

Final Checks

• My issue is written in English
• My issue title is descriptive
• This is a single feature request (multiple feature requests should be reported individually)
• I can help with the improvement or development of this feature (tick if you can help)

[MrKai77]

Would custom window sizes work for you? And if not, can you specify what an internal size is? And a screen recording would be appreciated :)

[pcolton]

Here is a contrived example screenshot. Custom size works to a point, that's what I already tried, but I don't know how to compute the window size that would take into account the size of the inner frame (shown in the image as a red box). I would love to specify something like 1080x1920 for the INSIDE frame, and have the software compute the actual window size taking into account the outer frame (shown in the image as a blue box). But not sure there's even an API to determine that "inner frame" on macOS.