Tonya Mork 4b35425d7b Customize: Overlay incompatible banner for block themes.
Starting in 5.9, block themes are not compatible with (do not support) Customizer; rather, they use the Site Editor. Viewing installed themes in Customizer, this commit adds an overlay message to alert users and give them a way to activate the block theme. Clicking on the "Activate" button activates the block theme and redirects back to the Appearance > Themes interface, where the user can then enter the Site Editor for customization.

Non-block themes are not affected by this change and continue to work in Customizer.

Follow-up to [41648], [41893], [52279].

Props antonvlasenko, costdev, hellofromTonya, jffng, joyously, noisysocks, poena, shaunandrews.
Fixes #54549.

git-svn-id: https://develop.svn.wordpress.org/trunk@52371 602fd350-edb4-49c9-b593-d223f7449a82
2021-12-14 15:31:14 +00:00
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