Themes: Style the Theme Author the same in the multi and singular view, make the links readable. Fixes #26306

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Themes: Remove an unused Delete Theme link on the multiple view. See #25948

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Themes: Remove a mp6 reference which is no longer needed. See #25948

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Themes: Display Activated/Deleted messages below the H2, before the Themes. See #26305

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Themes: Add a default image for when a theme doesn't have a screenshot. Props matveb. See #25959

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Themes: Remove some unused CSS (we have neither a .theme-categories or .theme-linear-grid). See #25948

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Themes: Update the responsive layouts for the Search box after r26461. See #26305

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Themes: Remove a now defunct CSS class, .feature-container, which is no longer in use after r26141. See #25948

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Themes: Remove the Tabs from the header of the Add New Theme page. Fixes #26310

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Themes: Use _.throttle() instead of a custom one. Props matveb. Fixes #25981

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Themes: Add a clearing <br/> to the end of .theme-browser.
This is needed to cause the browser to render .theme-browser's height as it's true height, previously the reported height was 1*.theme which caused the Theme scroller to kick in immediately (as the threshold was less than 0).
See #25981 See #25948

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Themes: When the user doesn't have switch_themes capabilities, and we've passed the current theme, detect the theme slug/stylesheet correctly so that the flags are set properly. See #25948

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Themes: Do extra Cap checks before outputting links, and use full URI's. See #25948

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Remove RTL and MP6 references from colors-fresh.css as they're now irrelevant to the file.

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Themes: Restore a label accidentally removed in r26470. Props SergeyBiryukov. See #25948

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Themes: Add missing close tag, see [26462]. see #25959.
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Widgets: highlight all drop zones (open and closed sidebars) on starting to drag a widget to indicate "droppability", fixes #26168.
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Admin CSS: Pinking shears.
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Fix selector for category checklists to apply styles to custom taxonomies too.

props mattheu.
fixes #26324.
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Mobile: Add some bottom spacing to checkboxes on Nav Menu screen.

props mattheu.
fixes #26325.
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