PLANET-7635 Move remaining code from plugin

This is in preparation to finally retire it

assets/src/block-editor/addButtonLinkPasteWarning.js

@@ -0,0 +1,18 @@
+export const addButtonLinkPasteWarning = () => document.addEventListener('DOMContentLoaded', () => {
+  document.onpaste = event => {
+    const {target} = event;
+    if (!target.matches('.wp-block-button__link, .wp-block-button__link *')) {
+      return;
+    }
+
+    const aTags = target.querySelectorAll('a');
+    if (aTags.length) {
+      const {__} = wp.i18n;
+      // eslint-disable-next-line no-alert
+      alert(__(
+        'You are pasting a link into the button text. Please ensure your clipboard only has text in it. Alternatively you can press control/command + SHIFT + V to paste only the text in your clipboard.',
+        'planet4-blocks-backend'
+      ));
+    }
+  };
+});

assets/src/editorIndex.js

@@ -12,6 +12,7 @@ import {registerColumnsBlock} from './blocks/Columns/ColumnsBlock';
 import {registerBlockStyles} from './block-styles';
 import {registerBlockVariations} from './block-variations';
 import {registerActionButtonTextBlock} from './blocks/ActionCustomButtonText';
+import {addButtonLinkPasteWarning} from './block-editor/addButtonLinkPasteWarning';
 
 wp.domReady(() => {
   // Blocks
@@ -37,10 +38,9 @@ wp.domReady(() => {
 
   // Block variations
   registerBlockVariations();
-});
-
-setupCustomSidebar();
+  setupQueryLoopBlockExtension();
 
-// Setup new attributes to the core/query.
-// It should be executed after the DOM is ready
-setupQueryLoopBlockExtension();
+  // Editor behaviour.
+  setupCustomSidebar();
+  addButtonLinkPasteWarning();
+});

assets/src/scss/blocks.scss

@@ -29,6 +29,7 @@
 @import "blocks/core-overrides/Columns";
 @import "blocks/core-overrides/Heading";
 @import "blocks/core-overrides/Embed";
+@import "blocks/core-overrides/File";
 
 // Other
 @import "blocks/WideBlocks";

assets/src/scss/blocks/core-overrides/File.scss

@@ -0,0 +1,6 @@
+.wp-block-file .wp-block-file__button {
+  overflow: unset;
+  padding: 0 1em;
+  margin-inline-start: 1em;
+  font-size: .8em;
+}