feat(conversation): adjust scroll to unread mentions

- previous 'unreadMentionIndices' was accounting only for sortedConversationsList, but we render ConversationsListVirtual#listItems and should compute indexes directly from it

Assisted-by: ClaudeCode:claude-sonnet-5
Signed-off-by: Maksim Sukharev <antreesy.web@gmail.com>

Author: Antreesy

src/components/LeftSidebar/ConversationsList/ConversationsListVirtual.vue

@@ -14,7 +14,7 @@ import ConversationItem from './ConversationItem.vue'
 import ConversationTagHeader from './ConversationTagHeader.vue'
 import { AVATAR, CONVERSATION } from '../../../constants.ts'
 import { useConversationTagsStore } from '../../../stores/conversationTags.ts'
-import { hasCall, hasUnreadMessages } from '../../../utils/conversation.ts'
+import { hasCall, hasUnreadMentions, hasUnreadMessages } from '../../../utils/conversation.ts'
 
 export type VirtualListItem = (Conversation | TagHeaderItem) & { _key?: string }
 
@@ -349,11 +349,35 @@ function scrollToConversation(token: string) {
 	}
 }
 
+/**
+ * Get the indices (in the flattened virtual-list, i.e. tag-header- and
+ * collapsed-section-aware) of conversations with unread mentions.
+ */
+function getUnreadMentionIndices(): number[] {
+	const indices: number[] = []
+	listItems.value.forEach((item, index) => {
+		if (!isTagHeader(item) && hasUnreadMentions(item)) {
+			indices.push(index)
+		}
+	})
+	return indices
+}
+
+/**
+ * Get the index (in the flattened virtual-list) of the last unread-mention
+ * conversation currently below the viewport, or null if there is none.
+ */
+function getLastUnreadMentionBelowViewportIndex(): number | null {
+	const lastInViewport = getLastItemInViewportIndex()
+	return getUnreadMentionIndices().findLast((idx) => idx > lastInViewport) ?? null
+}
+
 defineExpose({
 	getFirstItemInViewportIndex,
 	getLastItemInViewportIndex,
 	scrollToItem,
 	scrollToConversation,
+	getLastUnreadMentionBelowViewportIndex,
 })
 </script>
 

src/components/LeftSidebar/LeftSidebar.vue

@@ -696,14 +696,8 @@ export default {
 			return sortConversationsList(this.filteredConversationsList, this.groupMode, this.sortOrder)
 		},
 
-		unreadMentionIndices() {
-			const indices = []
-			for (const i in this.sortedConversationsList) {
-				if (hasUnreadMentions(this.sortedConversationsList[i])) {
-					indices.push(i)
-				}
-			}
-			return indices
+		hasUnreadMentionsInList() {
+			return this.sortedConversationsList.filter(hasUnreadMentions).length
 		},
 
 		emptyContentLabel() {
@@ -816,7 +810,7 @@ export default {
 			}
 		},
 
-		unreadMentionIndices() {
+		hasUnreadMentionsInList() {
 			this.debounceHandleScroll()
 		},
 	},
@@ -1143,22 +1137,12 @@ export default {
 		},
 
 		handleScroll() {
-			this.computeLastUnreadMention()
-		},
-
-		/**
-		 * Find position of the last unread conversation below viewport.
-		 * Iterates only over indices with unread mentions (cached via the
-		 * unreadMentionIndices computed) instead of the full list.
-		 */
-		computeLastUnreadMention() {
-			if (!this.$refs.scroller) {
-				this.lastUnreadMentionBelowViewportIndex = null
-				return
-			}
-			const lastInViewport = this.$refs.scroller.getLastItemInViewportIndex()
-			this.lastUnreadMentionBelowViewportIndex = this.unreadMentionIndices
-				.findLast((idx) => idx > lastInViewport) ?? null
+			/**
+			 * Find position of the last unread conversation below viewport.
+			 * Delegates to the scroller, which owns the flattened list (tag
+			 * headers and sections) and its indexes.
+			 */
+			this.lastUnreadMentionBelowViewportIndex = this.$refs.scroller?.getLastUnreadMentionBelowViewportIndex() ?? null
 		},
 
 		async scrollToConversation(token) {