Did anyone test if this action is being executed on theme upgrade?
Are there any other actions I could use to attach a theme uninstall function?
Does the switch_theme action run when you’re upgrading a theme?
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My educated guess is that process is implemented in Theme_Upgrader class.
It does some stuff with
upgrader_post_installhook (seems like a good candidate) and it does runswitch_theme()under some conditions (that I am too lazy to make sense of at moment).