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My take:

Programmatically maximize a form without covering the Taskbar

https://stackoverflow.com/a/29228674/1908746

https://stackoverflow.com/a/58840717/1908746

My take:

Pass mouse events through to the parent control

https://stackoverflow.com/a/8635626/1908746

https://docs.microsoft.com/en-us/windows/win32/inputdev/wm-nchittest

My take:

Move and resize a borderless form

https://stackoverflow.com/a/2575452/1908746

https://stackoverflow.com/a/32261547/1908746

My take: