rename feature flag for Threads

src/MatrixClientPeg.ts

@@ -213,6 +213,7 @@ class MatrixClientPegClass implements IMatrixClientPeg {
         opts.pendingEventOrdering = PendingEventOrdering.Detached;
         opts.lazyLoadMembers = true;
         opts.clientWellKnownPollPeriod = 2 * 60 * 60; // 2 hours
+        opts.experimentalThreadSupport = SettingsStore.getValue("experimentalThreadSupport");
 
         // Connect the matrix client to the dispatcher and setting handlers
         MatrixActionCreators.start(this.matrixClient);

src/components/structures/MessagePanel.tsx

@@ -446,7 +446,7 @@ export default class MessagePanel extends React.Component<IProps, IState> {
         // Always show highlighted event
         if (this.props.highlightedEventId === mxEv.getId()) return true;
 
-        const threadingEnabled = SettingsStore.getValue("feature_threading");
+        const threadingEnabled = SettingsStore.getValue("experimentalThreadSupport");
         if (threadingEnabled && mxEv.replyEventId && this.props.hideThreadedMessages === true) {
             return false;
         }

src/settings/Settings.tsx

@@ -211,8 +211,11 @@ export const SETTINGS: {[setting: string]: ISetting} = {
         supportedLevels: LEVELS_FEATURE,
         default: false,
     },
-    "feature_threading": {
+    "experimentalThreadSupport": {
         isFeature: true,
+        // Requires a reload as we change an option flag on the `js-sdk`
+        // And the entire sync history needs to be parsed again
+        controller: new ReloadOnChangeController(),
         displayName: _td("Threaded messaging"),
         supportedLevels: LEVELS_FEATURE,
         default: false,