Save/load which accounts are collapsed

TODO.md

@@ -9,6 +9,8 @@
   - Unfinished work in button-refactor branch
     - Button can get "hoverEnabled: false" to let HoverHandlers work
   - Room Sidepane
+    - Hide when window too small
+    - Also save/load its size
   - When qml syntax highlighting supports string interpolation, use them
 
 - Fixes

src/qml/SidePane/AccountDelegate.qml

@@ -12,6 +12,15 @@ Column {
     property var userInfo: users.find(model.userId)
     property bool expanded: true
 
+    Component.onCompleted: {
+        expanded = ! window.uiState.collapseAccounts[model.userId]
+    }
+
+    onExpandedChanged: {
+        window.uiState.collapseAccounts[model.userId] = ! expanded
+        window.uiStateChanged()
+    }
+
     HInteractiveRectangle {
         width: parent.width
         height: childrenRect.height