Disable full screen mode on Linux (#3151)

src/main/menus/app.ts

@@ -231,7 +231,7 @@ export function createTemplate(config: Config, updateManager: UpdateManager) {
         ]);
     }
 
-    const viewSubMenu = [{
+    const viewSubMenu: Electron.MenuItemConstructorOptions[] = [{
         label: localizeMessage('main.menus.app.view.find', 'Find..'),
         accelerator: 'CmdOrCtrl+F',
         click() {
@@ -250,11 +250,17 @@ export function createTemplate(config: Config, updateManager: UpdateManager) {
             session.defaultSession.clearCache();
             ViewManager.reload();
         },
-    }, {
+    }];
+
+    if (process.platform !== 'linux') {
+        viewSubMenu.push({
             role: 'togglefullscreen',
             label: localizeMessage('main.menus.app.view.fullscreen', 'Toggle Full Screen'),
             accelerator: isMac ? 'Ctrl+Cmd+F' : 'F11',
-    }, separatorItem, {
+        });
+    }
+
+    viewSubMenu.push(separatorItem, {
         label: localizeMessage('main.menus.app.view.actualSize', 'Actual Size'),
         role: 'resetZoom',
         accelerator: 'CmdOrCtrl+0',
@@ -284,7 +290,7 @@ export function createTemplate(config: Config, updateManager: UpdateManager) {
     }, separatorItem, {
         label: localizeMessage('main.menus.app.view.devToolsSubMenu', 'Developer Tools'),
         submenu: devToolsSubMenu,
-    }];
+    });
 
     if (process.platform !== 'darwin' && process.platform !== 'win32') {
         viewSubMenu.push(separatorItem);

src/main/windows/mainWindow.ts

@@ -74,7 +74,7 @@ export class MainWindow extends EventEmitter {
 
         const windowOptions: BrowserWindowConstructorOptions = Object.assign({}, this.savedWindowState, {
             title: app.name,
-            fullscreenable: true,
+            fullscreenable: process.platform !== 'linux',
             show: false, // don't start the window until it is ready and only if it isn't hidden
             paintWhenInitiallyHidden: true, // we want it to start painting to get info from the webapp
             minWidth: MINIMUM_WINDOW_WIDTH,
@@ -231,6 +231,10 @@ export class MainWindow extends EventEmitter {
     };
 
     private shouldStartFullScreen = () => {
+        if (process.platform === 'linux') {
+            return false;
+        }
+
         if (global?.args?.fullscreen !== undefined) {
             return global.args.fullscreen;
         }

src/renderer/components/SettingsPage.tsx

@@ -982,6 +982,7 @@ class SettingsPage extends React.PureComponent<Props, State> {
             </FormCheck>,
         );
 
+        if (process.platform !== 'linux') {
             options.push(
                 <FormCheck
                     key='inputStartInFullScreen'
@@ -1008,6 +1009,7 @@ class SettingsPage extends React.PureComponent<Props, State> {
                     </FormText>
                 </FormCheck>,
             );
+        }
 
         options.push(
             <div