Add rich message editor with media, tables and math formulas.Show rich message drafts with full formatting in chat compose area.Add text recognition with selection and copying to media viewer images.Add swipe navigation and pinch zoom gestures to media viewer.Support zoom and dragging files out in shared media photos.Allow adapting existing stickers into custom emoji.Add media viewer video playback to system media controls.Add alphabetical fast-scroll index to contacts box.Improve screen reader accessibility for chats list and folders.