While the inject-helper tries to hook an application, the source is
set to `active` until the inject-helper reports being unable to hook.
If the graphics thread updates the transformations of every source in
that time frame, the game-capture source will report the width and
height used from the last valid capture, leading to its selection box
flickering in and out of view.
Ensuring that width and height are only reported when the source is not
only made active but is also capturing content fixes the flickering
issue.
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