Fix RoomPane buttons background static height

TODO.md

@@ -1,6 +1,5 @@
 # TODO
 
-- Make dark bar extend down pane
 - Verify default size
 
 ## Media
@@ -33,7 +32,6 @@
 
 ## Refactoring
 
-- Coroutine future OR document uuid
 - Account settings with `HTabbedContainer`
   - Get rid of all `currentSpacing` stuff
   - Use new default/reset controls system 

src/gui/Pages/Chat/RoomPane/RoomPane.qml

@@ -19,7 +19,9 @@ HDrawer {
             color: theme.chat.roomPaneButtons.background
 
             Layout.fillWidth: true
-            Layout.preferredHeight: theme.baseElementsHeight
+            Layout.preferredHeight: buttonFlow.height
+
+            Behavior on Layout.preferredHeight { HNumberAnimation {} }
         }
 
         Rectangle {
@@ -39,6 +41,7 @@ HDrawer {
         anchors.fill: parent
 
         HFlow {
+            id: buttonFlow
             populate: null
 
             Layout.fillWidth: true