Process(windows): try sending WM_CLOSE for graceful process termination #13108
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This PR takes the QT method of sending WM_CLOSE to all application window, then send WM_CLOSE to the main thread of the child process.
Description
Windows always makes things more complicated.
On Windows, there are multiple ways to gracefully terminate a process.
GenerateConsoleCtrlEvent
.None of these two ways cover all applications - WM_CLOSE only works when the program has a message loop like in GUI programs,
GenerateConsoleCtrlEvent
has quirks.Existing Issue(s)