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The machinery for suppressing the displayport during live resizes was using the Observer service. However, in the case of multiple browser windows, this meant that all the open browser windows would have their displayport suppressed if *any* of the browser windows was being resized. This was mostly ok, as the displayport suppression would be turned off once the resize ended. However, the code to kick off a repaint with the unsuppressed displayport would only get triggered on one of the windows (whichever happened to process the unsuppress message last). This patch stops using the Observer service for the implementation machinery, and instead locates the active TabParent of the relevant nsWindow, and invokes the displayport suppression directly on that. This fixes the repainting bug and also avoids unnecessarily broadcasting the suppression/unsuppression notification to windows that don't neccessarily need it. MozReview-Commit-ID: LBHOgOW9KUp |
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