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backend/drm: skip reset after VT switch if possible

Simon Ser requested to merge emersion/wlroots:skip-vt-switch-reset into master

If all connectors and planes already have the right CRTC set, or are disabled, we can skip the device-wide reset after a VT switch.

I've contemplated using a more fine-grained logic to only reset the connectors, CRTCs and planes that need to be migrated. However, writing a correct algorithm for this would be quite involved, and it doesn't seem worth the trouble anyways.


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