thumbnailing / image rescaling broken #71
Description
With current (at least 5.4 and 5.5) versions of WordPress and the PHP runtime (tested with php74 and the imagick extension enabled from app.yaml), and just the gcs-media-plugin enabled (not the appengine-plugin), rescaled images will not be generated even if the full-sized image successfully uploads.
This is due to assumptions in the WordPress "image editor" code that images are local files (rather than URLs / stream wrappers).
Filing this ticket here for tracking purposes, though I believe the correct fix for this issue should be made in WordPress core. I have a working patch and have submitted it to the WordPress tracker:
https://core.trac.wordpress.org/ticket/50630
Related posts:
https://wordpress.org/support/topic/thumbnails-broken-with-gcs-plugin/
https://scarff.id.au/blog/2020/wordpress-gcs-plugin-broken-thumbnails/