Merge pull request #20258 from calixteman/cleanup_before_editing_mode

[Editor] Cleanup the pages not being fully rendered before switching to editing mode

web/pdf_page_view.js

@@ -1080,6 +1080,10 @@ class PDFPageView extends BasePDFPageView {
         );
       }
     ).then(async () => {
+      if (this.renderingState !== RenderingStates.FINISHED) {
+        // The rendering has been cancelled.
+        return;
+      }
       this.structTreeLayer ||= new StructTreeLayerBuilder(
         pdfPage,
         viewport.rawDims

web/pdf_viewer.js

@@ -2525,6 +2525,8 @@ class PDFViewer {
       if (!isEditing) {
         this.pdfDocument.annotationStorage.resetModifiedIds();
       }
+      // We need to cleanup whatever pages being rendered.
+      this.cleanup();
       for (const pageView of this._pages) {
         pageView.toggleEditingMode(isEditing);
       }