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/molecules/RoomTooltip.css

@@ -0,0 +1,33 @@
+/*
+Copyright 2015 OpenMarket Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+.mx_RoomTooltip {
+    display: none;
+    position: fixed;
+    border: 1px solid #a9dbf4;
+    border-radius: 8px;
+    background-color: #fff;
+    z-index: 1000;
+    margin-top: 6px;
+    left: 64px;
+    padding: 6px;
+}
+
+.mx_RoomTooltip_chevron {
+    position: absolute;
+    left: -9px;
+    top: 8px;
+}