editors - bring back close() to inputs

src/vs/workbench/browser/parts/editor/editorGroupView.ts

@@ -530,11 +530,11 @@ export class EditorGroupView extends Themable implements IEditorGroupView {
 			editorsToClose.push(editor.master, editor.details);
 		}
 
-		// Dispose the editor when it is no longer open in any group including diff editors
+		// Forward close to editor input for handling within
 		editorsToClose.forEach(editorToClose => {
-			if (!this.accessor.groups.some(groupView => groupView.group.contains(editorToClose, true /* include side by side editor master & details */))) {
-				editorToClose.dispose();
-			}
+			const openedInOtherGroups = this.accessor.groups.some(groupView => groupView.group.contains(editorToClose, true /* include side by side editor master & details */));
+
+			editorToClose.close(this._group.id, openedInOtherGroups);
 		});
 
 		/* __GDPR__

src/vs/workbench/common/editor.ts

@@ -581,6 +581,21 @@ export abstract class EditorInput extends Disposable implements IEditorInput {
 		return undefined;
 	}
 
+	/**
+	 * Called when this input was closed in a group. The second parameter
+	 * is a hint wether the editor is still opened in other groups. This
+	 * may include normal editors as well as side-by-side or diff editors.
+	 *
+	 * Subclasses can override what should happen. By default, an editor
+	 * input will dispose when it is closed.
+	 */
+	close(group: GroupIdentifier, openedInOtherGroups: boolean): void {
+		// TODO@ben revisit this behaviour, should just dispose by default after adoption
+		if (!openedInOtherGroups) {
+			this.dispose();
+		}
+	}
+
 	/**
 	 * Subclasses can set this to false if it does not make sense to split the editor input.
 	 */

src/vs/workbench/contrib/files/common/editors/fileEditorInput.ts

@@ -303,6 +303,12 @@ export class FileEditorInput extends AbstractTextResourceEditorInput implements
 		return undefined;
 	}
 
+	close(group: GroupIdentifier, openedInOtherGroups: boolean): void {
+		if (!openedInOtherGroups) {
+			this.dispose(); // Only dispose if not opened anymore because all file inputs are shared
+		}
+	}
+
 	matches(otherInput: unknown): boolean {
 		if (super.matches(otherInput) === true) {
 			return true;

src/vs/workbench/services/untitled/common/untitledTextEditorInput.ts

@@ -3,7 +3,7 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-import { IEncodingSupport, EncodingMode, Verbosity, IModeSupport } from 'vs/workbench/common/editor';
+import { IEncodingSupport, EncodingMode, Verbosity, IModeSupport, GroupIdentifier } from 'vs/workbench/common/editor';
 import { AbstractTextResourceEditorInput } from 'vs/workbench/common/editor/textResourceEditorInput';
 import { IUntitledTextEditorModel } from 'vs/workbench/services/untitled/common/untitledTextEditorModel';
 import { ITextFileService } from 'vs/workbench/services/textfile/common/textfiles';
@@ -121,6 +121,12 @@ export class UntitledTextEditorInput extends AbstractTextResourceEditorInput imp
 		return this.modelResolve;
 	}
 
+	close(group: GroupIdentifier, openedInOtherGroups: boolean): void {
+		if (!openedInOtherGroups) {
+			this.dispose(); // Only dispose if not opened anymore because all untitled inputs are shared
+		}
+	}
+
 	matches(otherInput: unknown): boolean {
 		if (super.matches(otherInput) === true) {
 			return true;