Update $_old_files for 3.9. see #27775.

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Custom Headers: Allow for longer strings.

props ehg.
see #27755.

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User Query: Don't blindly re-append new meta queries for capabilities.

fixes #21119.

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About page: Translate all Under the Hood strings.

see #27713.

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Update the TinyMCE paste plugin to the latest development version. It includes a fix for pasting from Word: removes inline comments and change tracking.
Changeset: https://github.com/tinymce/tinymce/commit/f8cffdf34287afaa54ffbf7d6b0eb7b22a8c27ac
Fixes #27771
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Add a feature pointer for widgets in the customizer in 3.9. Remove older pointers from 3.3 and 3.4.

see #27777.

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Add an explanation for 'Paste from Word' in the 'Paste from Text' dialog.

fixes #27777. see #27160.

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Translate another About string and use _e(). see #27713.

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The widgets pointer requires the edit_theme_options capability.

(It's hypothetically possible to have only switch_themes.)

see #27777.

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RTL for TinyMCE:
- Add _dir: 'rtl' to the TinyMCE translation object.
- Fix editor.css for RTL.
- Fix the Edit and Delete buttons position for wpview and images.
- For _mce_set_direction(), update documentation and fix adding the 'ltr' button.
Fixes #27773
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Add hooks to the wpeditimage tinymce plugin and to the image details portion of the media modal.
- Add wp.media.events which is intended to be a global media event bus.
- Add a post-render event to the ImageDetails view that third-party code can leverage to add subviews.
- Performance improvement for the initialization of the PostImage model.
- A bit more markup to the image details template to make it easier to add a view to the advanced options.
Props gcorne, fixes #27698
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