Changes rtl check in ChatMessages class (#4049)

* Added view-d-room to guest role

So they can see direct messages.

* valueChanged optimization

valueChange checks if the text is rtl or ltr on every input, changed the method to check only the first input.

* Update startup.coffee

* Fixes pr #4049

fixes the value.lenght to value.length and used the this.value instead of the value in the parameter

* Update chatMessages.coffee

* Update startup.coffee

* Update startup.coffee

packages/rocketchat-ui/lib/chatMessages.coffee

@@ -379,7 +379,8 @@ class @ChatMessages
 			RoomHistoryManager.clear rid
 
 	valueChanged: (rid, event) ->
-		this.determineInputDirection()
+		if this.input.value.length is 1
+			this.determineInputDirection()
 
 	determineInputDirection: () ->
 		this.input.dir = if this.isMessageRtl(this.input.value) then 'rtl' else 'ltr'