improve collapsed LHS implementation - split the tooltip into its own component; position it with javascript as overflow-y + position absolute = clipping hell; preserve the collapse state between MatrixChat re-renders; fix positioning of the 'show' button; switch to dispatcher for show/hide LHS; remove errant scrollbars

src/skins/vector/css/organisms/LeftPanel.css

@@ -33,13 +33,6 @@ limitations under the License.
     cursor: pointer;
 }
 
-.mx_LeftPanel_showButton {
-    position: absolute;
-    top: 18px;
-    left: 16px;
-    cursor: pointer;
-}
-
 .mx_LeftPanel .mx_RoomList {
     -webkit-box-ordinal-group: 1;
     -moz-box-ordinal-group: 1;
@@ -47,7 +40,7 @@ limitations under the License.
     -webkit-order: 1;
     order: 1;
 
-    overflow-y: scroll;
+    overflow-y: auto;
     -webkit-flex: 1 1 0;
     flex: 1 1 0;
 }
@@ -69,10 +62,6 @@ limitations under the License.
     color: #378bb4;
 }
 
-.mx_LeftPanel .mx_BottomLeftMenu .mx_RoomTile_avatar {
-    padding-left: 14px;
-}
-
 .mx_LeftPanel .mx_BottomLeftMenu .mx_BottomLeftMenu_options {
     margin-top: 12px;
     width: 100%;