diff --git a/src/vs/workbench/common/editor.ts b/src/vs/workbench/common/editor.ts
index 59f12493062..22caaaa4e86 100644
--- a/src/vs/workbench/common/editor.ts
+++ b/src/vs/workbench/common/editor.ts
@@ -598,6 +598,9 @@ export abstract class EditorInput extends Disposable implements IEditorInput {
 
 	close(group: GroupIdentifier, openedInOtherGroups: boolean): void {
 		// TODO@ben revisit this behaviour, should just dispose by default after adoption
+		// However this requires that we never open the same input in multiple editor groups
+		// which today we cannot enforce (e.g. when opening the same editor in an empty
+		// group via quick open editor history)
 		if (!openedInOtherGroups) {
 			this.dispose();
 		}
@@ -798,10 +801,6 @@ export class SideBySideEditorInput extends EditorInput {
 		this._register(this.master.onDidChangeLabel(() => this._onDidChangeLabel.fire()));
 	}
 
-	async resolve(): Promise<EditorModel | null> {
-		return null;
-	}
-
 	matches(otherInput: unknown): boolean {
 		if (super.matches(otherInput) === true) {
 			return true;
diff --git a/src/vs/workbench/contrib/extensions/electron-browser/runtimeExtensionsInput.ts b/src/vs/workbench/contrib/extensions/electron-browser/runtimeExtensionsInput.ts
index c40a9f95f48..8fa384f074a 100644
--- a/src/vs/workbench/contrib/extensions/electron-browser/runtimeExtensionsInput.ts
+++ b/src/vs/workbench/contrib/extensions/electron-browser/runtimeExtensionsInput.ts
@@ -5,7 +5,7 @@
 
 import * as nls from 'vs/nls';
 import { URI } from 'vs/base/common/uri';
-import { EditorInput, GroupIdentifier } from 'vs/workbench/common/editor';
+import { EditorInput } from 'vs/workbench/common/editor';
 
 export class RuntimeExtensionsInput extends EditorInput {
 
@@ -37,12 +37,6 @@ export class RuntimeExtensionsInput extends EditorInput {
 		return false;
 	}
 
-	close(group: GroupIdentifier, openedInOtherGroups: boolean): void {
-		if (!openedInOtherGroups) {
-			this.dispose(); // Only dispose if not opened anymore because all runtime extensions inputs are shared
-		}
-	}
-
 	matches(other: unknown): boolean {
 		return other instanceof RuntimeExtensionsInput;
 	}
diff --git a/src/vs/workbench/contrib/files/common/editors/fileEditorInput.ts b/src/vs/workbench/contrib/files/common/editors/fileEditorInput.ts
index d59090dc55c..d338237cde4 100644
--- a/src/vs/workbench/contrib/files/common/editors/fileEditorInput.ts
+++ b/src/vs/workbench/contrib/files/common/editors/fileEditorInput.ts
@@ -303,12 +303,6 @@ 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;
diff --git a/src/vs/workbench/contrib/searchEditor/browser/searchEditorInput.ts b/src/vs/workbench/contrib/searchEditor/browser/searchEditorInput.ts
index 5178fcbba70..3d1f4407810 100644
--- a/src/vs/workbench/contrib/searchEditor/browser/searchEditorInput.ts
+++ b/src/vs/workbench/contrib/searchEditor/browser/searchEditorInput.ts
@@ -180,10 +180,6 @@ export class SearchEditorInput extends EditorInput {
 		return localize('searchTitle', "Search");
 	}
 
-	async resolve() {
-		return null;
-	}
-
 	setDirty(dirty: boolean) {
 		this.dirty = dirty;
 		this._onDidChangeDirty.fire();
diff --git a/src/vs/workbench/contrib/webview/browser/webviewEditorInput.ts b/src/vs/workbench/contrib/webview/browser/webviewEditorInput.ts
index cee6146281e..c5b4ebcd05e 100644
--- a/src/vs/workbench/contrib/webview/browser/webviewEditorInput.ts
+++ b/src/vs/workbench/contrib/webview/browser/webviewEditorInput.ts
@@ -99,10 +99,6 @@ export class WebviewInput extends EditorInput {
 		this._group = group;
 	}
 
-	public async resolve(): Promise<null> {
-		return null;
-	}
-
 	public supportsSplitEditor() {
 		return false;
 	}
diff --git a/src/vs/workbench/services/untitled/common/untitledTextEditorInput.ts b/src/vs/workbench/services/untitled/common/untitledTextEditorInput.ts
index b84026d012a..7ecff1fba99 100644
--- a/src/vs/workbench/services/untitled/common/untitledTextEditorInput.ts
+++ b/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, GroupIdentifier } from 'vs/workbench/common/editor';
+import { IEncodingSupport, EncodingMode, Verbosity, IModeSupport } 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';
@@ -121,12 +121,6 @@ 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;