Make the DFW paragraph on the About page narrower to mitigate an orphan in Firefox.

Merges [30921] to the 4.1 branch.

See #30435
Props melchoyce

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Customizer: Export Preview instance to `wp.customize.preview`.

Merges [30891] to the 4.1 branch.

see #30409, #30726.

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Twenty Fifteen: Don't escape translated strings.

Replace every unnecessary instance of `esc_html__()` and `esc_html_e()` with just `__()` and `_e()`.

Merges [30896] to the 4.1 branch.

see #30724.

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Twenty Fifteen: Remove `esc_html()` from blog description.

The blog description gets esc_html()'d *into* the DB. It's also escaped because the filter for `get_bloginfo()` is set to 'display'.

Merges [30897] to the 4.1 branch.

see #30724.

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Twenty Fifteen: Remove various unnecessary `esc_html()` calls and replace various unnecessary `esc_html_x()` calls with `_x()`.

Merges [30899], [30901], and [30905] into 4.1.

Props ocean90
Fixes #30724

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Twenty Fifteen: Don't save unfiltered CSS in a setting.

Introduce `twentyfifteen_get_color_scheme_css( $colors )` which will be used for Underscore/Backbone and the PHP side. Let `twentyfifteen_color_scheme_css()` handle the color calculation on PHP side.

Merges [30893] to the 4.1 branch.

Fixes #30409.
Props ocean90

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4.1 RC2

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Last about page string. Merges [30929] to the 4.1 branch.

props celloexpressions.
fixes #30435.

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Customizer: Add `_wp_attachment_is_custom_background` meta to uploaded background images.

Merges [30885] to the 4.1 branch.

props ocean90.
fixes #30707.

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Twenty Fifteen: Use dynamic default color value instead of hardcoded color.

Merges [30932] to the 4.1 branch.

props iamtakashi.
see #30733.

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Fix MEjs styles for screen reader text and overflow on the volume slider.

Merges [30907] to the 4.1 branch.

props obenland.
see #30281.

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Merge Twenty Fifteen commits [30828], [30833], [30869] to the 4.1 branch.
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Merge Twenty Fifteen commits [30834], [30845] to the 4.1 branch.
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Twenty Fifteen, editor-style: remove margin-bottom from the gallery preview inside the editor.

Merges [30836] to the 4.1 branch.

props azaozz.
see #30697.
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Twenty Fifteen: update scroll functionality to make sure child menu items are always reachable.

Merges [30838] to the 4.1 branch.

props iamtakashi.
see #30674.
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Twenty Fifteen: fallback hex color for no-comments text should come first.

Merges [30910] to the 4.1 branch.

props iamtakashi.
see #30730.
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No need for wp_get_password_hint() to be prefixed as if it is private.

Merges [30855] to the 4.1 branch.

props nacin.
see #21243.
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Twenty Twelve: fix widget stacking problem in older IE browsers for Front Page template.

Merges [30868] to the 4.1 branch.

props TomasM, hiwhatsup.
see #28938.
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Editor, new DFW: fix fading out for the right sidebar in IE.

Merges [30853] to the 4.1 branch.

Fixes #30714.

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Add braces around a Docblock in an if statement, although not required by PHP, this is required by our coding standards for readability.
Introduced in 3.9 with r27365

Merges [30886] to the 4.1 branch.

See #25905

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