Tweak read marker behavior

When no scrolling is possible, add delay before clearing.

Small related code cleanup.

Signed-off-by: Vincent Petry <vincent@nextcloud.com>

src/components/MessagesList/MessagesList.vue

@@ -414,8 +414,11 @@ export default {
 
 			// if no scrollbars, clear read marker directly as scrolling is not possible for the user to clear it
 			// also clear in case lastReadMessage is zero which is due to an older bug
-			if (this.conversation.lastReadMessage === 0 || (this.isWindowVisible && document.hasFocus() && this.scroller.scrollHeight <= this.scroller.offsetHeight)) {
-				this.$store.dispatch('clearLastReadMessage', { token: this.token })
+			if (this.conversation.lastReadMessage === 0
+				|| (this.isWindowVisible && document.hasFocus() && this.scroller.scrollHeight <= this.scroller.offsetHeight)
+			) {
+				// clear after a delay, unless scrolling can resume in-between
+				this.debounceUpdateReadMarkerAfterScroll()
 			}
 		},
 
@@ -752,7 +755,9 @@ export default {
 			}
 
 			// if we're at bottom of the chat and focussed, then simply clear the marker
-			if (this.isSticky && this.isWindowVisible && document.hasFocus()) {
+			if (this.conversation.lastReadMessage === 0
+				|| (this.isSticky && this.isWindowVisible && document.hasFocus())
+			) {
 				this.$store.dispatch('clearLastReadMessage', { token: this.token })
 				return
 			}

src/services/messagesService.js

@@ -147,14 +147,9 @@ const postRichObjectToConversation = async function(token, { objectType, objectI
  * @param {int} lastReadMessage id of the last read message to set
  */
 const updateLastReadMessage = async function(token, lastReadMessage) {
-	try {
-		const response = await axios.post(generateOcsUrl('apps/spreed/api/v1', 2) + `chat/${token}/read`, {
-			lastReadMessage,
-		})
-		return response
-	} catch (error) {
-		console.error(`Error while updating the last read message to {lastReadMessage}`, error)
-	}
+	return axios.post(generateOcsUrl('apps/spreed/api/v1', 2) + `chat/${token}/read`, {
+		lastReadMessage,
+	})
 }
 
 export {

src/store/messagesStore.js

@@ -344,8 +344,6 @@ const actions = {
 		// optimistic early commit to avoid indicator flickering
 		context.commit('updateConversationLastReadMessage', { token, lastReadMessage: id })
 		await updateLastReadMessage(token, id)
-
-		// TODO: update unread counters if possible (otherwise user needs to wait for conversation list refresh)
 	},
 }