Problem/Motivation
The alternative text field in the CKEditor5 image dialog only allows for about 35 characters. This places a cognitive load on content editors whenever appropriate alternative text requires more than 35 characters. My understanding is that ideal alternative text is about 127 characters or less.
It would be better, whenever the alternative text needs to be larger than the field size, to have the default be that all such alternative text is visible while the content editor is initially entering or later reviewing it.
The only currently available work around is to type the alternative text elsewhere and copy it. Again, this place is a cognitive load on content editors.
Steps to reproduce
Steps (in Google Chrome):
1. Go to simplytest.me
2. Type core in the field
3. Select Drupal core, latest version
4. Click the button to create the site
5. Log in as admin
6. If the management menu is not displayed, click Manage
7. Click content
8. Click add content
9. Click Basic page
10. Click in the body field
11. Click the image icon in the WYSIWYG toolbar
12. Navigate to an image in your computer's file system
13. Click Open
14. Type "012345678 12345678 22345678 32345678"
Expected result: I can see everything that I have typed.
Actual result: Earlier-typed content scrolls out of the visible field contents.
Proposed resolution
Option one: Enlarge the field to as wide as feasible.
Option two: Grow the field horizontally as the content exceeds the field width.
Option three: Grow the field vertically as the content exceeds the field width. I recognize that this is not typical for a plain text field, but it would allow the alternative text to be as long as it needs to be to be as is appropriate for the given image.
Merge request link
Remaining tasks
User interface changes
Same as proposed resolution.