(core) Bug fix: when on Raw Data popup, clicks on cells shouldn't navigate the page

Test Plan: Added a test check that fails without the fix

Reviewers: paulfitz

Reviewed By: paulfitz

Subscribers: paulfitz

Differential Revision: https://phab.getgrist.com/D3831

app/client/components/GristDoc.ts

@@ -524,7 +524,7 @@ export class GristDoc extends DisposableWithEvents {
   }
 
   public async setCursorPos(cursorPos: CursorPos) {
-    if (cursorPos.sectionId) {
+    if (cursorPos.sectionId && cursorPos.sectionId !== this.externalSectionId.get()) {
       const desiredSection: ViewSectionRec = this.docModel.viewSections.getRowModel(cursorPos.sectionId);
       if (desiredSection.view.peek().getRowId() !== this.activeViewId.get()) {
         // This may be asynchronous. In other cases, the change is synchronous, and some code