fix(Link): fixed addLink action behavior (#763)

Author: d3m1d0v

src/extensions/markdown/Link/PlaceholderWidget/commands.ts

@@ -1,13 +1,20 @@
-import type {Command} from 'prosemirror-state';
+import {toggleMark} from '#pm/commands';
+import type {Command} from '#pm/state';
 
 import type {ExtensionDeps} from '../../../../core';
+import {linkType} from '../LinkSpecs';
 
 import {addPlaceholder} from './descriptor';
 
 export const addLinkPlaceholder =
     (deps: ExtensionDeps): Command =>
     (state, dispatch) => {
         if (!state.selection.empty) return false;
+
+        const markType = linkType(state.schema);
+        if (markType.isInSet(state.selection.$from.marks())) return false;
+        if (!toggleMark(markType)(state)) return false;
+
         dispatch?.(addPlaceholder(state.tr, deps).scrollIntoView());
         return true;
     };

src/extensions/markdown/Link/actions/linkEnhanceActions.ts

@@ -24,12 +24,13 @@ export const addEmptyLink: Command = (state, dispatch) => {
     // text selection inside one text node
     if ($from.parent !== $to.parent) return false;
     let tr = state.tr;
-    toggleMark(linkMarkType, {
+    const toggleResult = toggleMark(linkMarkType, {
         [LinkAttr.Href]: '',
         [LinkAttr.IsPlaceholder]: true,
     })(state, (_tr) => {
         tr = _tr;
     });
+    if (!toggleResult) return false;
     tr.scrollIntoView();
     if (selection instanceof NodeSelection) {
         tr.setSelection(NodeSelection.create(tr.doc, $to.pos - 1));