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Always disable V-Sync in the editor to improve UI responsiveness

Rafał Mikrut requested to merge github/fork/Calinou/disable-vsync-in-editor into master

Created by: Calinou

The project's V-Sync value is no longer used to control whether the editor should use V-Sync.

Note that the graphics driver may still force V-Sync; in this case, this change will have no effect (it will be enabled as it was before).

If editing a project with V-Sync enabled (which is the default) and your graphics driver doesn't force V-Sync, this should increase responsiveness since there is no longer an inherent 1-frame delay caused by V-Sync.

If the editor has to be continuously redrawn for any reason, the rendering will be capped at 100 FPS if the editor is set to Update Changes, which is the default option.

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