fix(overlay-menu): Adding, changing and removing segmentation overlays should update the overlay menu instantly (#5181)

tests/MPRThenRTOverlayNoHydration.spec.ts

@@ -10,11 +10,12 @@ test.beforeEach(async ({ page }) => {
 test('should launch MPR with unhydrated RTSTRUCT chosen from the data overlay menu', async ({
   page,
 }) => {
-  await page.getByTestId('side-panel-header-right').click();
-
   await page.getByTestId('Layout').click();
   await page.getByTestId('MPR').click();
 
+  // Wait 5 seconds for MPR to load. This is necessary in particular when screen shots are added or replaced.
+  await page.waitForTimeout(5000);
+
   await checkForScreenshot(
     page,
     page,
@@ -31,6 +32,9 @@ test('should launch MPR with unhydrated RTSTRUCT chosen from the data overlay me
   // Hide the overlay menu.
   await page.getByTestId('dataOverlayMenu-mpr-sagittal-btn').click();
 
+  // Wait 5 seconds for RT to load. This is necessary in particular when screen shots are added or replaced.
+  await page.waitForTimeout(5000);
+
   await checkForScreenshot(
     page,
     page,