fix: add missing set_wants_to_be_visible(true) to NativeWindowMac::ShowInactive() (electron#40546)

* fix: add missing set_wants_to_be_visible(true) to NativeWindowMac::ShowInactive()

* add test

Author: tzahola

shell/browser/native_window_mac.mm

@@ -534,6 +534,8 @@ void ReorderChildWindowAbove(NSWindow* child_window, NSWindow* other_window) {
 }
 
 void NativeWindowMac::ShowInactive() {
+  set_wants_to_be_visible(true);
+
   // Reattach the window to the parent to actually show it.
   if (parent())
     InternalSetParentWindow(parent(), true);

spec/api-browser-window-spec.ts

@@ -1144,6 +1144,34 @@ describe('BrowserWindow module', () => {
         await shown;
         expect(w.isMaximized()).to.equal(true);
       });
+
+      ifit(process.platform === 'darwin')('should attach child window to parent', async () => {
+        const wShow = once(w, 'show');
+        w.show();
+        await wShow;
+
+        const c = new BrowserWindow({ show: false, parent: w });
+        const cShow = once(c, 'show');
+        c.showInactive();
+        await cShow;
+
+        // verifying by checking that the child tracks the parent's visibility
+        const minimized = once(w, 'minimize');
+        w.minimize();
+        await minimized;
+
+        expect(w.isVisible()).to.be.false('parent is visible');
+        expect(c.isVisible()).to.be.false('child is visible');
+
+        const restored = once(w, 'restore');
+        w.restore();
+        await restored;
+
+        expect(w.isVisible()).to.be.true('parent is visible');
+        expect(c.isVisible()).to.be.true('child is visible');
+
+        closeWindow(c);
+      });
     });
 
     describe('BrowserWindow.focus()', () => {