This updates the 4.4 branch to support the latest LTS version of NodeJS (currently 14.x), allowing the same version to be used across all WordPress branches that receive security updates as a courtesy.
Because older branches use (really) old versions of NodeJS, the local Docker environment cannot be backported since the needed dependencies will not run on these older versions (see #48301). This also blocks the ability to move automated testing over to GitHub Actions (see #50401).
This also replaces the `npm-shrinkwrap.json` with a `package-lock.json` file. Lock files were not supported in earlier versions of NPM, but can now be used.
In addition to backporting the package updates that happened after branching 4.4, dependencies that were removed in future releases have also been updated to their latest versions.
Props desrosj, dd32, netweb, jorbin.
Merges [35859,35862,36860-36865,36935,36978-36979,37017,37019-37020,37212,37612,38111,38688,39110,39113-39119,39478,42460-42461,42463,42887,43320,43323,43977,44219,44233,44728,45321,45765,46404,46408-46409,47404,47867-47869,47872-47873,48705,49636,49933,49937,49939,50017,50126,50176,50185,50192] to the 4.4 branch.
See #52341.
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In the data sent to us from the embedded iframe by postMessage(), the secret value is being used directly in a document.querySelectorAll() call without first being validated or escaped.
In theory, this could lead to some broken embeds.
Props mdawaffe.
Fixes#34831.
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Older versions of WordPress will convert those `&` characters to `&`, which makes for some non-functional JS. If folks are running an older release, let's not make their lives more difficult than it already is.
Props pento, peterwilsoncc.
See #34698.
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Sometimes, embedded sites might suffer from less than 100% uptime. Instead of leaving the embedding site with a big blank space where the embed should be, let's fall back to a link to the embedded post, so there's at least some context for the post.
Fixes#34462.
Built from https://develop.svn.wordpress.org/trunk@35437
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