Hides the "Hide menu bar" option on MacOS (#2903)

The "Hide menu bar" option is only applicable to Windows and some Linux distros,
where the menu bar is attached to the Signal window. Therefore, this commit
ensures that it doesn't show up on MacOS. It includes a setting,
isHideMenuBarSupported(), to control the option's appearance. This
commit also includes the tests to make sure isHideMenuBarSupported()
works correctly.

Fixes #2705

js/views/settings_view.js

@@ -106,12 +106,14 @@
         value: window.initialData.spellCheck,
         setFn: window.setSpellCheck,
       });
+      if (Settings.isHideMenuBarSupported()) {
         new CheckboxView({
           el: this.$('.menu-bar-setting'),
           name: 'menu-bar-setting',
           value: window.initialData.hideMenuBar,
           setFn: window.setHideMenuBar,
         });
+      }
       new MediaPermissionsSettingView({
         el: this.$('.media-permissions'),
         value: window.initialData.mediaPermissions,
@@ -140,6 +142,7 @@
         nameOnly: i18n('nameOnly'),
         audioNotificationDescription: i18n('audioNotificationDescription'),
         isAudioNotificationSupported: Settings.isAudioNotificationSupported(),
+        isHideMenuBarSupported: Settings.isHideMenuBarSupported(),
         themeLight: i18n('themeLight'),
         themeDark: i18n('themeDark'),
         hideMenuBar: i18n('hideMenuBar'),

settings.html

@@ -54,10 +54,12 @@
       </div>
     </div>
     <br />
+    {{ #isHideMenuBarSupported }}
     <div class='menu-bar-setting'>
       <input type='checkbox' name='hide-menu-bar' id='hide-menu-bar'/>
       <label for='hide-menu-bar'>{{ hideMenuBar }}</label>
     </div>
+    {{ /isHideMenuBarSupported }}
     <hr>
     <div class='notification-settings'>
       <h3>{{ notifications }}</h3>

ts/test/types/Settings_test.ts

@@ -130,4 +130,65 @@ describe('Settings', () => {
       });
     });
   });
+  describe('isHideMenuBarSupported', () => {
+    context('on macOS', () => {
+      beforeEach(() => {
+        sandbox.stub(process, 'platform').value('darwin');
+      });
+
+      afterEach(() => {
+        sandbox.restore();
+      });
+
+      it('should return false', () => {
+        assert.isFalse(Settings.isHideMenuBarSupported());
+      });
+    });
+
+    context('on Windows', () => {
+      context('version 7', () => {
+        beforeEach(() => {
+          sandbox.stub(process, 'platform').value('win32');
+          sandbox.stub(os, 'release').returns('7.0.0');
+        });
+
+        afterEach(() => {
+          sandbox.restore();
+        });
+
+        it('should return true', () => {
+          assert.isTrue(Settings.isHideMenuBarSupported());
+        });
+      });
+
+      context('version 8+', () => {
+        beforeEach(() => {
+          sandbox.stub(process, 'platform').value('win32');
+          sandbox.stub(os, 'release').returns('8.0.0');
+        });
+
+        afterEach(() => {
+          sandbox.restore();
+        });
+
+        it('should return true', () => {
+          assert.isTrue(Settings.isHideMenuBarSupported());
+        });
+      });
+    });
+
+    context('on Linux', () => {
+      beforeEach(() => {
+        sandbox.stub(process, 'platform').value('linux');
+      });
+
+      afterEach(() => {
+        sandbox.restore();
+      });
+
+      it('should return true', () => {
+        assert.isTrue(Settings.isHideMenuBarSupported());
+      });
+    });
+  });
 });

ts/types/Settings.ts

@@ -9,3 +9,6 @@ export const isAudioNotificationSupported = () =>
 // https://github.com/electron/electron/issues/11189
 export const isNotificationGroupingSupported = () =>
   !OS.isWindows() || OS.isWindows(MIN_WINDOWS_VERSION);
+
+// the "hide menu bar" option is specific to Windows and Linux
+export const isHideMenuBarSupported = () => !OS.isMacOS();