fix(segmentation): Added support for unhydrated RTSTRUCT in MPR. Added support for overlaying segmentations over display sets the segmentations do not reference. (#5168)

tests/RTNoHydrationThenMPR.spec.ts

@@ -0,0 +1,22 @@
+import { test } from 'playwright-test-coverage';
+import { visitStudy, checkForScreenshot, screenShotPaths } from './utils';
+
+test.beforeEach(async ({ page }) => {
+  const studyInstanceUID = '1.3.6.1.4.1.5962.99.1.2968617883.1314880426.1493322302363.3.0';
+  const mode = 'viewer';
+  await visitStudy(page, studyInstanceUID, mode, 2000);
+});
+
+test('should launch MPR with unhydrated RTSTRUCT', async ({ page }) => {
+  await page.getByTestId('side-panel-header-right').click();
+  await page.getByTestId('study-browser-thumbnail-no-image').dblclick();
+
+  await page.waitForTimeout(5000);
+  await checkForScreenshot(page, page, screenShotPaths.rtNoHydrationThenMPR.rtNoHydrationPreMPR);
+
+  await page.getByTestId('Layout').click();
+  await page.getByTestId('MPR').click();
+
+  await page.waitForTimeout(5000);
+  await checkForScreenshot(page, page, screenShotPaths.rtNoHydrationThenMPR.rtNoHydrationPostMPR);
+});