Support for Drupal 7 is ending on 5 January 2025—it’s time to migrate to Drupal 10! Learn about the many benefits of Drupal 10 and find migration tools in our resource center.
The issue looks similar to 1330794.
When the current theme is sub-theme and option "Use theme CSS" is on, only sub-theme CSS is loaded in editor (CKEditor in my case), but not the base theme CSS.
Configuration:
Base theme - Bootstrap
Current theme - custom theme based on Bootstrap CDN starterkit
Admin theme - Garland
Theme for content editing - the same as current (Use admin theme for content editing is set to No)
Comments
Comment #2
TwoDPlease try the patch in #2289683: Select in-editor theme and get all stylesheets, the approach used there should make sure all stylesheets are included.