Extension suggestion: add Close button to make UI more consistent with QuickWatch

[IanKemp]

As you can see from the above, the QuickWatch window has a "Close" button at the bottom-right. Muscle memory means I assume that the "Copy" button in the ReadableExpressions visualisation window is also a close button, and when I click it I get confused because the window doesn't close.

I would suggest adding an actual Close button to the right of the Copy button.

[SteveWilkes]

Thanks for the suggestion - sounds reasonable! Will do :)