Address feedback

Use more specific css rules for the emoji dimensions in the chat list status preview.

Use more round em value for chat list item height.
Add global html overflow and height for smoother chat navigation in
the desktop Safari.

Use offsetHeight instad of a computed style when setting the window height on resize.

Remove margin-bottom from the last message to avoid occasional layout shift in the desktop Safari

Use break-word to prevent chat message text overflow

Resize and scroll the textarea when inserting a new line on ctrl+enter

Remove fade transition on route change

Ensure proper border radius at the bottom of the chat, remove unused border-radius

Prevent the chat header "jumping" on the avatar load.

src/components/chat/chat.js

@@ -2,29 +2,26 @@ import _ from 'lodash'
 import { WSConnectionStatus } from '../../services/api/api.service.js'
 import { mapGetters, mapState } from 'vuex'
 import ChatMessage from '../chat_message/chat_message.vue'
-import ChatAvatar from '../chat_avatar/chat_avatar.vue'
 import PostStatusForm from '../post_status_form/post_status_form.vue'
 import ChatTitle from '../chat_title/chat_title.vue'
 import chatService from '../../services/chat_service/chat_service.js'
-import ChatLayout from './chat_layout.js'
 import { getScrollPosition, getNewTopPosition, isBottomedOut, scrollableContainerHeight } from './chat_layout_utils.js'
 
 const BOTTOMED_OUT_OFFSET = 10
 const JUMP_TO_BOTTOM_BUTTON_VISIBILITY_OFFSET = 150
+const SAFE_RESIZE_TIME_OFFSET = 100
 
 const Chat = {
   components: {
     ChatMessage,
     ChatTitle,
-    ChatAvatar,
     PostStatusForm
   },
-  mixins: [ChatLayout],
   data () {
     return {
       jumpToBottomButtonVisible: false,
       hoveredMessageChainId: undefined,
-      scrollPositionBeforeResize: {},
+      lastScrollPosition: {},
       scrollableContainerHeight: '100%',
       errorLoadingChat: false
     }
@@ -119,6 +116,7 @@ const Chat = {
     },
     onFilesDropped () {
       this.$nextTick(() => {
+        this.handleResize()
         this.updateScrollableContainerHeight()
       })
     },
@@ -129,13 +127,30 @@ const Chat = {
         }
       })
     },
-    handleLayoutChange () {
-      this.updateScrollableContainerHeight()
-      if (this.mobileLayout) {
-        this.setMobileChatLayout()
-      } else {
-        this.unsetMobileChatLayout()
+    setChatLayout () {
+      //   This is a hacky way to adjust the global layout to the mobile chat (without modifying the rest of the app).
+      //   This layout prevents empty spaces from being visible at the bottom
+      //   of the chat on iOS Safari (`safe-area-inset`) when
+      //   - the on-screen keyboard appears and the user starts typing
+      //   - the user selects the text inside the input area
+      //   - the user selects and deletes the text that is multiple lines long
+      //   TODO: unify the chat layout with the global layout.
+      let html = document.querySelector('html')
+      if (html) {
+        html.classList.add('chat-layout')
       }
+
+      this.$nextTick(() => {
+        this.updateScrollableContainerHeight()
+      })
+    },
+    unsetChatLayout () {
+      let html = document.querySelector('html')
+      if (html) {
+        html.classList.remove('chat-layout')
+      }
+    },
+    handleLayoutChange () {
       this.$nextTick(() => {
         this.updateScrollableContainerHeight()
         this.scrollDown()
@@ -149,15 +164,24 @@ const Chat = {
       this.scrollableContainerHeight = scrollableContainerHeight(inner, header, footer) + 'px'
     },
     // Preserves the scroll position when OSK appears or the posting form changes its height.
-    handleResize (opts) {
+    handleResize (opts = {}) {
+      const { expand = false, delayed = false } = opts
+
+      if (delayed) {
+        setTimeout(() => {
+          this.handleResize({ ...opts, delayed: false })
+        }, SAFE_RESIZE_TIME_OFFSET)
+        return
+      }
+
       this.$nextTick(() => {
         this.updateScrollableContainerHeight()
 
-        const { offsetHeight = undefined } = this.scrollPositionBeforeResize
-        this.scrollPositionBeforeResize = getScrollPosition(this.$refs.scrollable)
+        const { offsetHeight = undefined } = this.lastScrollPosition
+        this.lastScrollPosition = getScrollPosition(this.$refs.scrollable)
 
-        const diff = this.scrollPositionBeforeResize.offsetHeight - offsetHeight
-        if (diff < 0 || (!this.bottomedOut() && opts && opts.expand)) {
+        const diff = this.lastScrollPosition.offsetHeight - offsetHeight
+        if (diff < 0 || (!this.bottomedOut() && expand)) {
           this.$nextTick(() => {
             this.updateScrollableContainerHeight()
             this.$refs.scrollable.scrollTo({
@@ -281,7 +305,12 @@ const Chat = {
         .then(data => {
           this.$store.dispatch('addChatMessages', { chatId: this.currentChat.id, messages: [data] }).then(() => {
             this.$nextTick(() => {
-              this.updateScrollableContainerHeight()
+              this.handleResize()
+              // When the posting form size changes because of a media attachment, we need an extra resize
+              // to account for the potential delay in the DOM update.
+              setTimeout(() => {
+                this.updateScrollableContainerHeight()
+              }, SAFE_RESIZE_TIME_OFFSET)
               this.scrollDown({ forceRead: true })
             })
           })