This addresses a major bug. Incorrectly setting the `$content_width` causes media embeds to end up with the wrong aspect ratio, among other issues. This fix uses `template_redirect`, to ensure conditional theme tags can be used. It also defines a default value at `after_theme_setup` so that plugins have something to work with at `init`.
Props sstoqnov, laurelfulford, obenland.
Merges [39635] to the 4.7 branch.
Fixes#39272.
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Featured image support means that attachments can now be imported. Media can be sideloaded from within theme or plugin directories. Like other posts, attachments are auto-drafts until customizer changes are published, and are not duplicated when they already exist in the customized state. Attachment IDs can be used for any number of purposes, much like post IDs. Twenty Seventeen now includes 3 images used as featured images to best showcase the multi-section homepage setup.
As featured image IDs are stored in post meta, it also made sense to add support for page templates. Twenty Seventeen does not include any such templates, but the functionality can be quite important for displaying themes to their best effect.
props westonruter, helen, flixos90.
fixes#38615.
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The `sizes` attribute was calculated incorrectly, resulting in the browser downloading the wrong resource. This filters the attribute to correct that.
Before the filter, the `img` contained:
`sizes="(max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px"`
And after:
`sizes="100vw"`
Props joemcgill, transl8or.
Fixes#38847.
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Some widgets that require more configuration are not included, such as RSS and Custom Menu. Tag Cloud is also not included because fresh sites do not have any tags to display.
Also adds a search widget to a Twenty Seventeen footer widget area.
see #38615.
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IE9 doesn't understands `vh ` (vertical height) when inside of an `iframe`. Normally IE9 will understand `vh` as the vertical height relative to the viewport, but in an `iframe`, IE9 thinks the vertical height is relative to the size of the whole page. So this fixes that when the site is viewed in the Customizer preview – an `iframe`.
Props laurelfulford.
Fixes#38722.
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* Relies on header skip link instead of l10n variables in JavaScript.
* Fixes issue where scroll down arrow appeared next to the navigation on the front page with no header image or video. It now only appears with a big header.
Props enodekciw, laurelfulford.
Fixes#38502.
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A theme can opt-in for tailored starter content to apply to the customizer when previewing the theme on a fresh install, when `fresh_site` is at its initial `1` value. Starter content is staged in the customizer and does not go live unless the changes are published. Initial starter content is added to Twenty Seventeen.
* The `fresh_site` flag is cleared when a published post or page is saved, when widgets are modified, or when the customizer state is saved.
* Starter content is registered via `starter-content` theme support, where the argument is an array containing `widgets`, `posts`, `nav_menus`, `options`, and `theme_mods`. Posts/pages in starter content are created with the `auto-draft` status, re-using the page/post stubs feature added to nav menus and the static front page controls.
* A `get_theme_starter_content` filter allows for plugins to extend a theme's starter content.
* Starter content in themes can/should re-use existing starter content items in core by using named placeholders.
* Import theme starter content into customized state when fresh site.
* Prevent original_title differences from causing refreshes if title is present.
* Ensure nav menu item url is set according to object when previewing.
* Make sure initial saved state is false if there are dirty settings without an existing changeset.
* Ensure dirty settings are cleaned upon changeset publishing.
Props helen, westonruter, ocean90.
Fixes#38114, #38533.
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Dion Hulse
Helen Hou-Sandí
David A. Kennedy
Tammie Lister
Weston Ruter