Overview: Inline image improvements

[paaljoachim]

What problem does this address?

EDITING this issue to focus on various Inline image issues.

It is very limited in how we can control the Inline Image.
Here is an example of what it currently looks like.

What is your proposed solution?

As @melchoyce mentioned in this comment:
#19426 (comment)
"It might make more sense to refactor inline images to be child blocks, so they can have their own toolbar for settings. That would help eliminate this one-off UI and make the block's behavior more consistent."
Based on Mathias comment below. We need to instead create a custom UI for the inline image feature.

Overview of Inline Image issues:

An example would be to control the height as mentioned in this issue.
#18035

Improve inline image sizing
#19426

Inline Images: Can't replace image
#25909

Inline images shows as Unattached in the media library
#17658

Inline linked image: inline popovers overlap and can hardly be used
#15761

Inline Images no longer show handles when selected
#15083

Inline images can't be resized using only the keyboard
#10595

How to create a custom inline-block?
#10235

It was brought up during a design triage on Slack:
https://wordpress.slack.com/archives/C02S78ZAL/p1612282641102200

[mtias]

It's not possible to use child blocks for inline images. Blocks are block elements, not inline formatting. Improvements to inline images UI should be proposed separately and need custom UI.

[paaljoachim]

I can edit this issue to become an inline image tracking issue instead. Then I will look at creating a custom UI issue for the inline images.

[mtias]

Yes, the width in particular is quite confusing.

[XVII]

An additional item for your inline image megathread: #48150

[westonruter]

Another inline image issue, this time from Trac: Core-59352 "Inline images inserted in the block editor can erroneously get fetchpriority=high". Also mentioned there is the incorrect width and height are added by wp_img_tag_add_width_and_height_attr(), resulting in wp_img_tag_add_srcset_and_sizes_attr() adding the wrong sizes which finally results in an oversized image being served.

[mrwweb]

#63323: "No ability to edit inline image alt text in context"