* Fix resolution restore. Screen resolution changes may be slow and cause errors in judgment. Remove the consideration of resolution changes caused by other processes.
* Keep the design unchange: when all connections end, revert to the resolution when there were no connections.
* Resolution menu use `scaledRect` for retina
* I can't reproduce the restoration failure of retina with 3rd software, but it maybe the same reason of slow resolution change.
Signed-off-by: 21pages <pages21@163.com>
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