WP 5.6.2 backports (#29058)

* Backport #26475 for the 5.6 branch.

* Backport #28604.

* Revert "Backport #28604."

This reverts commit 32784b6.

* Backport #26583 to the 5.6 branch.

* Commit lock file updates.

* Committing lock file differences after updating `browserslist`.

* Pin the version of NodeJS in the Compressed Size workflow.

* Memoize getEntityRecords to prevent infinite re-renders (#26447)

* Fix issue where gallery block requests all attachments when empty (#28621)

* Return early from building attachments for galleries

* Improve code clarity

* Fix link control styles to prevent scrollbar (#27777)

* Update package-lock

* Update package-lock again

Co-authored-by: Jonathan Desrosiers <desrosj@users.noreply.github.com>
Co-authored-by: Kai Hao <kevin830726@gmail.com>
Co-authored-by: Daniel Richards <daniel.richards@automattic.com>
Co-authored-by: Aaron Robertshaw <60436221+aaronrobertshaw@users.noreply.github.com>

.github/workflows/bundle-size.yml

@@ -12,6 +12,24 @@ jobs:
       with:
         fetch-depth: 1
 
+    - name: Cache node modules
+      uses: actions/cache@v2
+      env:
+        cache-name: cache-node-modules
+      with:
+        # npm cache files are stored in `~/.npm` on Linux/macOS
+        path: ~/.npm
+        key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-build-${{ env.cache-name }}-
+          ${{ runner.os }}-build-
+          ${{ runner.os }}-
+
+    - name: Use Node.js 12.x
+      uses: actions/setup-node@v1
+      with:
+        node-version: 12.x
+
     - uses: preactjs/compressed-size-action@v1
       with:
         repo-token: "${{ secrets.GITHUB_TOKEN }}"

lib/global-styles.php

@@ -334,6 +334,12 @@ function gutenberg_experimental_global_styles_get_theme_support_settings() {
 			$theme_settings['global']['settings']['typography'] = array();
 		}
 		$theme_settings['global']['settings']['typography']['fontSizes'] = array();
+		// Back-compatibility for presets without units.
+		foreach ( $theme_font_sizes[0] as &$font_size ) {
+			if ( is_numeric( $font_size['size'] ) ) {
+				$font_size['size'] = $font_size['size'] . 'px';
+			}
+		}
 		$theme_settings['global']['settings']['typography']['fontSizes'] = $theme_font_sizes[0];
 	}