Fix unused locals and better receiver selector available media checking

ext/src/background/receiverSelector/PopupReceiverSelector.ts

@@ -16,7 +16,6 @@ export default class PopupReceiverSelector
         implements ReceiverSelector {
 
     private windowId: number;
-    private openerWindowId: number;
 
     private messagePort: browser.runtime.Port;
     private messagePortDisconnected: boolean;
@@ -102,7 +101,6 @@ export default class PopupReceiverSelector
         this._isOpen = true;
 
         this.windowId = popup.id;
-        this.openerWindowId = openerWindow.id;
 
         // Size/position not set correctly on creation (bug?)
         await browser.windows.update(this.windowId, {
@@ -168,7 +166,6 @@ export default class PopupReceiverSelector
 
         // Cleanup
         this.windowId = null;
-        this.openerWindowId = null;
         this.messagePort = null;
         this.receivers = null;
         this.defaultMediaType = null;

ext/src/background/receiverSelector/ReceiverSelectorManager.ts

@@ -83,6 +83,29 @@ async function getSelection (
         });
 
 
+        const opts = await options.getAll();
+
+        // Remove mirroring media types if mirroring is not enabled.
+        if (!opts.mirroringEnabled) {
+            availableMediaTypes &= ~(
+                    ReceiverSelectorMediaType.Tab
+                  | ReceiverSelectorMediaType.Screen);
+        }
+
+        // Remove file media type if local media is not enabled
+        if (!opts.mediaEnabled || !opts.localMediaEnabled) {
+            availableMediaTypes &= ~ReceiverSelectorMediaType.File;
+        }
+
+        if (!availableMediaTypes || availableMediaTypes
+                === ReceiverSelectorMediaType.File) {
+            console.error("fx_cast (Debug): No available media types");
+            resolve(null);
+
+            return;
+        }
+
+
         // Ensure status manager is initialized
         await StatusManager.init();