WPLinkPreview only works in the first editor instance

[iseulde]

It should be set up outside the plugin callback, and each editor should have its own postrender callback.

[iseulde]

Here's a patch that also fixes some other issues, but probably better to do this in steps.
https://core.trac.wordpress.org/attachment/ticket/32604/32604.15.patch

• Fixes this issue.
• Adds some basic tests.
• Always trim the middle and don't set a character limit for the URL. This can be trimmed in CSS.
• If the URL is just a hash or query, don't link it.

Todo: Relative URLs should be corrected.

[iseulde]

Above patch uses the editor.addButton method instead. With that we can add some editor specific settings like onPostRender.

[azaozz]

33264.patch works well.

[ocean90]

33264.patch​ looks good and works with three editors on one page.

[iseulde]

In 33584:

TinyMCE: wplink: fix WPLinkPreview for multiple editors

Fixes #33264.