re-work X11 capturing from a window
authorTony Cook <tony@develop-help.com>
Thu, 5 Dec 2019 10:22:32 +0000 (10:22 +0000)
committerTony Cook <tony@develop-help.com>
Thu, 5 Dec 2019 10:22:32 +0000 (10:22 +0000)
Previously this would use XGetImage() on the window itself, but
this returns a completely black image in some cases on more modern
X11 servers.

Fetching a window now fetches from the root window instead, adjusting
co-ordinates to match.


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