Restore backend settings on reload

Reload does not create fresh targets but triggers a TargetInfoChanged
event. We can reconfigure the emulation mode then.

Fixed: 417173420
Bug: 40285513
Change-Id: Id16b700dd9b92ed2681fe4f2ef967c35772a4859
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6765583
Reviewed-by: Alex Rudenko <[email protected]>
Commit-Queue: Philip Pfaffe <[email protected]>

Author: pfaffe

front_end/entrypoints/inspector_main/InspectorMain.ts

@@ -264,6 +264,9 @@ export class BackendSettingsSync implements SDK.TargetManager.Observer {
 
     this.#emulatePageFocusSetting = Common.Settings.Settings.instance().moduleSetting('emulate-page-focus');
     this.#emulatePageFocusSetting.addChangeListener(this.#update, this);
+    SDK.TargetManager.TargetManager.instance().addModelListener(
+        SDK.ChildTargetManager.ChildTargetManager, SDK.ChildTargetManager.Events.TARGET_INFO_CHANGED,
+        this.#targetInfoChanged, this);
 
     SDK.TargetManager.TargetManager.instance().observeTargets(this);
   }
@@ -286,6 +289,15 @@ export class BackendSettingsSync implements SDK.TargetManager.Observer {
     }
   }
 
+  #targetInfoChanged(event: Common.EventTarget.EventTargetEvent<Protocol.Target.TargetInfo>): void {
+    const targetManager = SDK.TargetManager.TargetManager.instance();
+    const target = targetManager.targetById(event.data.targetId);
+    if (!target || target.outermostTarget() !== target) {
+      return;
+    }
+    this.#updateTarget(target);
+  }
+
   targetAdded(target: SDK.Target.Target): void {
     this.#updateTarget(target);
   }