On Windows 10, the hidden taskbar won't be totally hidden, but having a
2 pixel margin on the screen. While a maximized app window will use up
the full screen, there will be overlapping between a hidden taskbar and
a maximized app window, which will impact window capture to that
maximized window. If the target window doesn't support GDI methods well,
the capture may be black (i.e. Chrome) or still (i.e. Word).
Because there is no solid way to identify a hidden taskbar window, we
have to make an exemption to the overlapping to a maximized window is
2-pixel X screen-width/height, which is thin enough to be noticed in
the cropping result.
Bug: chromium:838062
Change-Id: I9e0fbdf43b4445ca9fbbf5ed43bb266ae726a5b8
Reviewed-on: https://webrtc-review.googlesource.com/c/123261
Commit-Queue: Brave Yao <braveyao@webrtc.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#26755}
4e7058e621