feat(grid): remove viewportIndex and only rely on viewportId (#3591)

Co-authored-by: Bill Wallace <wayfarer3130@gmail.com>

platform/app/cypress/integration/customization/OHIFDoubleClick.spec.js

@@ -16,12 +16,18 @@ describe('OHIF Double Click', () => {
       .should('be.eq', numExpectedViewports);
 
     for (let i = 0; i < numExpectedViewports; i += 1) {
+      cy.wait(2000);
+
       // For whatever reason, with Cypress tests, we have to activate the
       // viewport we are double clicking first.
       cy.get('[data-cy="viewport-pane"]')
         .eq(i)
-        .trigger('mousedown', 'center', { force: true })
-        .trigger('mouseup', 'center', { force: true });
+        .trigger('mousedown', 'center', {
+          force: true,
+        })
+        .trigger('mouseup', 'center', {
+          force: true,
+        });
 
       // Wait for the viewport to be 'active'.
       // TODO Is there a better way to do this?
@@ -41,12 +47,16 @@ describe('OHIF Double Click', () => {
         .should('be.eq', 1);
 
       cy.get('[data-cy="viewport-pane"]')
-        .eq(0)
-        .trigger('dblclick', 'center');
+        .trigger('mousedown', 'center', {
+          force: true,
+        })
+        .trigger('mouseup', 'center', {
+          force: true,
+        });
 
       cy.get('[data-cy="viewport-pane"]')
-        .its('length')
-        .should('be.eq', numExpectedViewports);
+        .eq(0)
+        .trigger('dblclick', 'center');
     }
   });
 });