fix microsoft#51039 mapResourceToEditorCount for SideBySideEditorInpu…

…t.details

src/vs/workbench/common/editor/editorStacksModel.ts

@@ -533,7 +533,7 @@ export class EditorGroup implements IEditorGroup {
  }
  }
 
- private splice(index: number, del: boolean, editor?: EditorInput): void {
+ private splice(index: number, del: boolean, editor?: EditorInput | SideBySideEditorInput): void {
  const editorToDeleteOrReplace = this.editors[index];
 
  const args: any[] = [index, del ? 1 : 0];
@@ -569,7 +569,10 @@ export class EditorGroup implements IEditorGroup {
  }
  }
 
- private updateResourceMap(editor: EditorInput, remove: boolean): void {
+ private updateResourceMap(editor: EditorInput | SideBySideEditorInput, remove: boolean): void {
+ if (editor instanceof SideBySideEditorInput) {
+ this.updateResourceMap(editor.details, remove);
+ }
  const resource = toResource(editor, { supportSideBySide: true });
  if (resource) {
 
@@ -1221,6 +1224,7 @@ export class EditorStacksModel implements IEditorStacksModel {
 
  // Close the editor when it is no longer open in any group including diff editors
  editorsToClose.forEach(editorToClose => {
+
  const resource = editorToClose ? editorToClose.getResource() : void 0; // prefer resource to not close right-hand side editors of a diff editor
  if (!this.isOpen(resource || editorToClose)) {
  editorToClose.close();