feat(editor): Refactor link click handlers

New link click behaviour:
* Link left clicks without Ctrl/Meta open link bubble (Fixes: #3691)
* Link left clicks with Ctrl/Meta open link in new tab
* Link middle clicks open link in new tab
* Link middle clicks on Linux don't paste content (Fixes: #2198)
* No more custom open link handler in editor

Implementation details:
* Moved link click handler plugins back into Link mark class.
* Added 'data-md-href' attribute to a-elements in DOM, to be used in
  onClick handlers.

src/components/RichTextReader.vue

@@ -41,12 +41,6 @@ export default {
 			return [
 				RichText.configure({
 					editing: false,
-					link: {
-						onClick: (event, attrs) => {
-							this.$emit('click-link', event, attrs)
-							return true
-						},
-					},
 				}),
 			]
 		},
@@ -58,23 +52,6 @@ export default {
 			required: true,
 		},
 	},
-
-	mounted() {
-		this.$el.addEventListener('click', this.preventOpeningLinks, true)
-	},
-
-	unmounted() {
-		this.$el.removeEventListener('click', this.preventOpeningLinks, true)
-	},
-
-	methods: {
-		preventOpeningLinks(event) {
-			// We use custom onClick handler only for left clicks
-			if (event.target.closest('a') && event.button === 0 && !event.ctrlKey) {
-				event.preventDefault()
-			}
-		},
-	},
 }
 </script>
 

src/extensions/LinkBubblePluginView.js

@@ -40,8 +40,8 @@ class LinkBubblePluginView {
 	// Required for read-only mode on Firefox. For some reason, editor selection doesn't get
 	// updated when clicking a link in read-only mode on Firefox.
 	clickHandler = (event) => {
-		// Only regard left clicks without Ctrl
-		if (event.button !== 0 || event.ctrlKey) {
+		// Only regard left clicks without Ctrl/Meta
+		if (event.button !== 0 || event.ctrlKey || event.metaKey) {
 			return false
 		}
 

src/helpers/links.js

@@ -93,7 +93,7 @@ const parseHref = function(dom) {
 	return ref
 }
 
-const openLink = function(event, _attrs) {
+const openLink = function(event, target = '_self') {
 	const linkElement = event.target.closest('a')
 	const htmlHref = linkElement.href
 	const query = OC.parseQueryString(htmlHref)
@@ -128,7 +128,7 @@ const openLink = function(event, _attrs) {
 			return
 		}
 	}
-	window.open(htmlHref)
+	window.open(htmlHref, target)
 	return true
 }
 

src/marks/Link.js

@@ -21,19 +21,24 @@
  */
 
 import TipTapLink from '@tiptap/extension-link'
-import { domHref, parseHref, openLink } from './../helpers/links.js'
-import { clickHandler, clickPreventer } from '../plugins/link.js'
+import { Plugin, PluginKey } from '@tiptap/pm/state'
+import { domHref, parseHref } from './../helpers/links.js'
 
 const Link = TipTapLink.extend({
 
 	addOptions() {
 		return {
 			...this.parent?.(),
-			onClick: openLink,
 			relativePath: null,
 		}
 	},
 
+	addStorage() {
+		return {
+			nopaste: false,
+		}
+	},
+
 	addAttributes() {
 		return {
 			href: {
@@ -63,6 +68,7 @@ const Link = TipTapLink.extend({
 		return ['a', {
 			...mark.attrs,
 			href: domHref(mark, this.options.relativePath),
+			'data-md-href': mark.attrs.href,
 			rel: 'noopener noreferrer nofollow',
 		}, 0]
 	},
@@ -74,19 +80,49 @@ const Link = TipTapLink.extend({
 				return !key.startsWith('handleClickLink')
 			})
 
-		if (!this.options.openOnClick) {
-			return plugins
-		}
-
-		// add custom click handle plugin
+		// Custom click handler plugins
 		return [
 			...plugins,
-			clickHandler({
-				editor: this.editor,
-				type: this.type,
-				onClick: this.options.onClick,
+			new Plugin({
+				key: new PluginKey('textHandleClickLink'),
+				props: {
+					handleDOMEvents: {
+						// Prevent paste on middle click in links (Linux only)
+						// Open link in new tab on middle click
+						pointerup: (view, event) => {
+							if (event.target.closest('a') && event.button === 1 && !event.ctrlKey && !event.metaKey && !event.shiftKey) {
+								this.storage.nopaste = true
+								event.preventDefault()
+
+								const linkElement = event.target.closest('a')
+								window.open(linkElement.href, '_blank')
+							}
+						},
+						// Prevent paste on middle click in links (Linux only)
+						paste: (view, event) => {
+							if (event.target.closest('a') && this.storage.nopaste) {
+								event.stopPropagation()
+								event.preventDefault()
+								event.stopImmediatePropagation()
+								this.storage.nopaste = false
+							}
+						},
+						// Prevent open link on left click (required for read-only mode)
+						// Open link in new tab on Ctrl/Cmd + left click
+						click: (view, event) => {
+							if (event.target.closest('a')) {
+								if (event.button === 0) {
+									event.preventDefault()
+									if (event.ctrlKey || event.metaKey) {
+										const linkElement = event.target.closest('a')
+										window.open(linkElement.href, '_blank')
+									}
+								}
+							}
+						},
+					},
+				},
 			}),
-			clickPreventer(),
 		]
 	},
 })