Manual fixup for remaining q incantaions

* don't try to use `finally` as a static method
* work around absence of `allSettled`

src/components/structures/ScrollPanel.js

@@ -386,19 +386,12 @@ module.exports = React.createClass({
         debuglog("ScrollPanel: starting "+dir+" fill");
 
         // onFillRequest can end up calling us recursively (via onScroll
-        // events) so make sure we set this before firing off the call. That
+        // events) so make sure we set this before firing off the call.
-        // does present the risk that we might not ever actually fire off the
-        // fill request, so wrap it in a try/catch.
         this._pendingFillRequests[dir] = true;
-        var fillPromise;
-        try {
-            fillPromise = this.props.onFillRequest(backwards);
-        } catch (e) {
-            this._pendingFillRequests[dir] = false;
-            throw e;
-        }
 
-        q.finally(fillPromise, () => {
+        Promise.try(() => {
+            return this.props.onFillRequest(backwards);
+        }).finally(() => {
             this._pendingFillRequests[dir] = false;
         }).then((hasMoreResults) => {
             if (this.unmounted) {

src/components/structures/UserSettings.js

@@ -568,15 +568,16 @@ module.exports = React.createClass({
         });
         // reject the invites
         const promises = rooms.map((room) => {
-            return MatrixClientPeg.get().leave(room.roomId);
+            return MatrixClientPeg.get().leave(room.roomId).catch((e) => {
+                // purposefully drop errors to the floor: we'll just have a non-zero number on the UI
+                // after trying to reject all the invites.
+            });
         });
-        // purposefully drop errors to the floor: we'll just have a non-zero number on the UI
+        Promise.all(promises).then(() => {
-        // after trying to reject all the invites.
-        q.allSettled(promises).then(() => {
             this.setState({
                 rejectingInvites: false,
             });
-        }).done();
+        });
     },
 
     _onExportE2eKeysClicked: function() {

src/components/views/rooms/RoomSettings.js

@@ -183,6 +183,12 @@ module.exports = React.createClass({
         });
     },
 
+    /**
+     * Returns a promise which resolves once all of the save operations have completed or failed.
+     *
+     * The result is a list of promise state snapshots, each with the form
+     * `{ state: "fulfilled", value: v }` or `{ state: "rejected", reason: r }`.
+     */
     save: function() {
         var stateWasSetDefer = Promise.defer();
         // the caller may have JUST called setState on stuff, so we need to re-render before saving
@@ -194,8 +200,18 @@ module.exports = React.createClass({
             this.setState({ _loading: false});
         });
 
+        function mapPromiseToSnapshot(p) {
+            return p.then((r) => {
+                return { state: "fulfilled", value: r };
+            }, (e) => {
+                return { state: "rejected", reason: e };
+            });
+        }
+
         return stateWasSetDefer.promise.then(() => {
-            return q.allSettled(this._calcSavePromises());
+            return Promise.all(
+                this._calcSavePromises().map(mapPromiseToSnapshot),
+            );
         });
     },