Lexical: Updated URL handling, added mouse handling

- Removed URL protocol allow-list to allow any as per old editor.
- Added mouse handling, so that clicks below many last hard-to-escape
  block types will add an empty new paragraph for easy escaping &
  editing.

resources/js/wysiwyg/services/mouse-handling.ts

@@ -0,0 +1,63 @@
+import {EditorUiContext} from "../ui/framework/core";
+import {
+    $createParagraphNode, $getRoot,
+    $getSelection,
+    $isDecoratorNode, CLICK_COMMAND,
+    COMMAND_PRIORITY_LOW, KEY_ARROW_DOWN_COMMAND, KEY_ARROW_UP_COMMAND,
+    KEY_BACKSPACE_COMMAND,
+    KEY_DELETE_COMMAND,
+    KEY_ENTER_COMMAND, KEY_TAB_COMMAND,
+    LexicalEditor,
+    LexicalNode
+} from "lexical";
+import {$isImageNode} from "@lexical/rich-text/LexicalImageNode";
+import {$isMediaNode} from "@lexical/rich-text/LexicalMediaNode";
+import {getLastSelection} from "../utils/selection";
+import {$getNearestNodeBlockParent, $getParentOfType, $selectOrCreateAdjacent} from "../utils/nodes";
+import {$setInsetForSelection} from "../utils/lists";
+import {$isListItemNode} from "@lexical/list";
+import {$isDetailsNode, DetailsNode} from "@lexical/rich-text/LexicalDetailsNode";
+import {$isDiagramNode} from "../utils/diagrams";
+import {$isTableNode} from "@lexical/table";
+
+function isHardToEscapeNode(node: LexicalNode): boolean {
+    return $isDecoratorNode(node) || $isImageNode(node) || $isMediaNode(node) || $isDiagramNode(node) || $isTableNode(node);
+}
+
+function insertBelowLastNode(context: EditorUiContext, event: MouseEvent): boolean {
+    const lastNode = $getRoot().getLastChild();
+    if (!lastNode || !isHardToEscapeNode(lastNode)) {
+        return false;
+    }
+
+    const lastNodeDom = context.editor.getElementByKey(lastNode.getKey());
+    if (!lastNodeDom) {
+        return false;
+    }
+
+    const nodeBounds = lastNodeDom.getBoundingClientRect();
+    const isClickBelow = event.clientY > nodeBounds.bottom;
+    if (isClickBelow) {
+        context.editor.update(() => {
+            const newNode = $createParagraphNode();
+            $getRoot().append(newNode);
+            newNode.select();
+        });
+        return true;
+    }
+
+    return false;
+}
+
+
+export function registerMouseHandling(context: EditorUiContext): () => void {
+    const unregisterClick = context.editor.registerCommand(CLICK_COMMAND, (event): boolean => {
+        insertBelowLastNode(context, event);
+        return false;
+    }, COMMAND_PRIORITY_LOW);
+
+
+    return () => {
+        unregisterClick();
+    };
+}