Enable language switch for text widget

[herrvigg]

The text widget was broken since 2017 though the main issue was raised in 2018: #616.

It is a very complex feature to restore due to the way the widgets are updated in javascript with many dynamic behaviors and "internal" WP sync fields: https://make.wordpress.org/core/2017/05/23/addition-of-tinymce-to-the-text-widget/

There are several situations to handle:

• existing widget initialized with pre-loaded content
• widget updated (save button)
• widget added with or without existing switching buttons on the page.

This major rework of the text widget in qTranslate-XT requires several changes in the JS API with new functions exposed:

• attachContentHook
• attachEditorHook (*)
• setupLanguageSwitch

(*) attachEditorHook is renamed from setEditorHooks but normally third-party code should rather use loadAdditionalTinyMceHooks() for standard TinyMCE hooks.

[Hr0bar]

Hi herrvigg, thanks again for this work, when can we expect this to be released?

[herrvigg]

I was about to merge this but WP has released a new feature in WP 5.8 to manage the widgets... with Gutenberg.
Hopefully there's a new plugin "Classic Widgets" which disable this feature. It's very simple, by adding two filters, but I need to check this better and possibly do a similar workaround with Gutenberg using a single language mode.

[herrvigg]

Released in 3.11.0.