Rearrange dom hierarchy to put space panel at same level as LeftPanel

so they don't steal horizontal space from each other

res/css/structures/_LeftPanel.scss

@@ -19,7 +19,7 @@ $roomListCollapsedWidth: 68px;
 
 .mx_LeftPanel {
     background-color: $roomlist-bg-color;
-    min-width: 260px;
+    min-width: 200px;
     max-width: 50%;
 
     // Create a row-based flexbox for the GroupFilterPanel and the room list

res/css/structures/_MatrixChat.scss

@@ -66,7 +66,7 @@ limitations under the License.
 }
 
 /* not the left panel, and not the resize handle, so the roomview/groupview/... */
-.mx_MatrixChat > :not(.mx_LeftPanel):not(.mx_ResizeHandle) {
+.mx_MatrixChat > :not(.mx_LeftPanel):not(.mx_SpacePanel):not(.mx_ResizeHandle) {
     background-color: $primary-bg-color;
 
     flex: 1 1 0;

src/components/structures/LeftPanel.tsx

@@ -39,7 +39,6 @@ import { OwnProfileStore } from "../../stores/OwnProfileStore";
 import { MatrixClientPeg } from "../../MatrixClientPeg";
 import RoomListNumResults from "../views/rooms/RoomListNumResults";
 import LeftPanelWidget from "./LeftPanelWidget";
-import SpacePanel from "../views/spaces/SpacePanel";
 
 interface IProps {
     isMinimized: boolean;
@@ -390,11 +389,7 @@ export default class LeftPanel extends React.Component<IProps, IState> {
 
     public render(): React.ReactNode {
         let leftLeftPanel;
-        // Currently TagPanel.enableTagPanel is disabled when Legacy Communities are disabled so for now
-        // ignore it and force the rendering of SpacePanel if that Labs flag is enabled.
-        if (SettingsStore.getValue("feature_spaces")) {
-            leftLeftPanel = <SpacePanel />;
-        } else if (this.state.showGroupFilterPanel) {
+        if (this.state.showGroupFilterPanel) {
             leftLeftPanel = (
                 <div className="mx_LeftPanel_GroupFilterPanelContainer">
                     <GroupFilterPanel />

src/components/structures/LoggedInView.tsx

@@ -56,6 +56,7 @@ import Modal from "../../Modal";
 import { ICollapseConfig } from "../../resizer/distributors/collapse";
 import HostSignupContainer from '../views/host_signup/HostSignupContainer';
 import { IOpts } from "../../createRoom";
+import SpacePanel from "../views/spaces/SpacePanel";
 
 // We need to fetch each pinned message individually (if we don't already have it)
 // so each pinned message may trigger a request. Limit the number per room for sanity.
@@ -227,14 +228,7 @@ class LoggedInView extends React.Component<IProps, IState> {
         let size;
         let collapsed;
         const collapseConfig: ICollapseConfig = {
-            // TODO: the space panel currently does not have a fixed width,
-            // just the headers at each level have a max-width of 150px
-            // Taking 222px for the space panel for now,
-            // so this will look slightly off for now,
-            // depending on the depth of your space tree.
-            // To fix this, we'll need to turn toggleSize
-            // into a callback so it can be measured when starting the resize operation
-            toggleSize: 222 + 68,
+            toggleSize: 200,
             onCollapsed: (_collapsed) => {
                 collapsed = _collapsed;
                 if (_collapsed) {
@@ -668,13 +662,6 @@ class LoggedInView extends React.Component<IProps, IState> {
             bodyClasses += ' mx_MatrixChat_useCompactLayout';
         }
 
-        const leftPanel = (
-            <LeftPanel
-                isMinimized={this.props.collapseLhs || false}
-                resizeNotifier={this.props.resizeNotifier}
-            />
-        );
-
         return (
             <MatrixClientContext.Provider value={this._matrixClient}>
                 <div
@@ -686,7 +673,11 @@ class LoggedInView extends React.Component<IProps, IState> {
                     <ToastContainer />
                     <DragDropContext onDragEnd={this._onDragEnd}>
                         <div ref={this._resizeContainer} className={bodyClasses}>
-                            { leftPanel }
+                            { SettingsStore.getValue("feature_spaces") ? <SpacePanel /> : null }
+                            <LeftPanel
+                                isMinimized={this.props.collapseLhs || false}
+                                resizeNotifier={this.props.resizeNotifier}
+                            />
                             <ResizeHandle />
                             { pageElement }
                         </div>