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compositor: Handle synchronous messages while shutting down
During the shutdown process, various threads (such as the font cache thread) may be finishing up their work. If those threads make synchronous requests to the compositor, answer them -- even if the results will be unused. This is at least enough processing for them to finish their work and exit cleanly. This addresses crashes that are sometimes seen at exit, particuarly when the font cache thread tries to register a font during shutdown. In addition, this change also removes an unused compositor message.
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