PI: Call Close() on vertical bar window when horizontal window is closed and vice versa

[zadesai]

Detailed description of the pull request / Additional comments

Bug: PI crashes on relaunch when ClipboardMonitoring is enabled and we close the bar from the vertical window.
Problem: When we launch PI, we start both the vertical and horizontal window. As a part of Horizontal window load, we start the ClipboardMonitor instance. Now, when we close vertical window, the horizontal window is still activated and ClipboardMonitor is still running. When we start a new instance of PI, the new horiztontalWindow tries to start ClipboardMonitor again and thus failing at Debug.Assert(ListenerHwnd == listeningWindow, "Why are we trying to start with a different hwnd?");

Fix: Call horizontal window Close() from verticalwindow when closed and vice versa.

Also, updated the ClipboardMonitor to listen on PrimaryWindow HWND instead of barwindow HWND.

Validation steps performed

1. Launch PI
2. Move to vertical window
3. Close PI
4. Launch PI again from Dev Home Utilities and confirm there is no crash

PR checklist

• Closes Close window, relaunch from utilities causes PI to crash #3048

[timkur]

Ideally we'd have the Clipboard monitor using the PrimaryWindow's HWND for monitoring... then we could continue to monitor in the background without the bar windows being around. #Resolved

[zadesai]

Updated the code to use PrimaryWindow's HWND. However, still starting the monitor when barwindow is opened and stopping it when bar window is closed.

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In reply to: 2146322918