fix(many): add correct scale to stacked labels (#28163)

core/src/components/radio/radio.scss

@@ -253,10 +253,26 @@ input {
 }
 
 :host(.radio-label-placement-stacked) .label-text-wrapper {
+  @include transform(scale(#{$form-control-label-stacked-scale}));
+
   /**
    * The margin between the label and
    * the radio should be on the bottom
    * when the label sits on top.
    */
   @include margin(null, 0, $form-control-label-margin, 0);
+
+  /**
+   * Label text should not extend
+   * beyond the bounds of the radio.
+   */
+  max-width: calc(100% / #{$form-control-label-stacked-scale});
+}
+
+:host(.radio-label-placement-stacked.radio-alignment-start) .label-text-wrapper {
+  @include transform-origin(start, top);
+}
+
+:host(.radio-label-placement-stacked.radio-alignment-center) .label-text-wrapper {
+  @include transform-origin(center, top);
 }

core/src/components/radio/test/label-placement/radio.e2e.ts

@@ -168,3 +168,19 @@ configs().forEach(({ title, screenshot, config }) => {
     });
   });
 });
+
+configs({ modes: ['md'], directions: ['ltr'] }).forEach(({ title, config, screenshot }) => {
+  test.describe(title('radio: stacked long label'), () => {
+    test('long label should truncate', async ({ page }) => {
+      await page.setContent(
+        `
+          <ion-radio label-placement="stacked" alignment="start" style="width: 200px">Enable Notifications Enable Notifications Enable Notifications Enable Notifications Enable Notifications Enable Notifications Enable Notifications</ion-radio>
+        `,
+        config
+      );
+
+      const radio = page.locator('ion-radio');
+      await expect(radio).toHaveScreenshot(screenshot(`radio-label-stacked-long-label`));
+    });
+  });
+});