ClosePseudoConsole hangs if the flags for CreatePseudoConsole aren't 0

[TheLizzard]

If the console is created width CreatePseudoConsole(..., dwFlags=1), the program hangs forever when we use ClosePseudoConsole. This must be linked with this microsoft bug.

[TheLizzard]

Problem is in _terminal.pseudoconsole.Console.close_console which calls _terminal._pseudoconsole.ClosePseudoConsole which is basically the window API call ClosePseudoConsole.

From the Windows API docs:
"A final painted frame may arrive on the hOutput handle originally provided to CreatePsuedoConsole when this API is called. It is expected that the caller will drain this information from the communication channel buffer and either present it or discard it. Failure to drain the buffer may cause the Close call to wait indefinitely until it is drained or the communication channels are broken another way."

[TheLizzard]

I have no idea what the "final painted frame" and the "communication channel buffer" are. Note we are closing all pipes+processes before calling ClosePseudoConsole.