Ran into a few issues with this scripted function:
Toggle Borders and Caption From Window.

Issue 1: Inaccurate Window Sizing



This issue seems to be caused by calling before , instead of after it. However, it seems that a borderless window cannot be resized by . I managed to circumvent this by calling . Perhaps can be updated so that this workaround becomes unnecessary?

Issue 2: System Window Side Effects



This issue can mangle the Windows Shell & render it unusable. It is easily fixed by implementing a list of window classes that should always be ignored, as well as a list of window classes that should not have alternate styles applied. IMO these would be better situated as global settings, so that users can define said window class exclusions once & reuse them throughout their scripts.

Here is a Gist that contains & functions with the above fixes implemented.