[MM-38577] Allow exit of full screen mode using the restore button on Windows (#1744)

src/main/windows/windowManager.ts

@@ -466,6 +466,9 @@ export function restore() {
     if (focused) {
         focused.restore();
     }
+    if (focused?.isFullScreen()) {
+        focused.setFullScreen(false);
+    }
 }
 
 export function reload() {

src/renderer/components/MainPage.tsx

@@ -346,7 +346,7 @@ export default class MainPage extends React.PureComponent<Props, State> {
         }
 
         let maxButton;
-        if (this.state.maximized) {
+        if (this.state.maximized || this.state.fullScreen) {
             maxButton = (
                 <div
                     className='button restore-button'