fileEditorInput: do more caching and drop cache when new formatter registered

fixes #79742

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

@@ -4,7 +4,7 @@
  *--------------------------------------------------------------------------------------------*/
 
 import { localize } from 'vs/nls';
-import { memoize } from 'vs/base/common/decorators';
+import { createMemoizer } from 'vs/base/common/decorators';
 import { dirname } from 'vs/base/common/resources';
 import { URI } from 'vs/base/common/uri';
 import { EncodingMode, ConfirmResult, EditorInput, IFileEditorInput, ITextEditorModel, Verbosity, IRevertOptions } from 'vs/workbench/common/editor';
@@ -23,6 +23,7 @@ const enum ForceOpenAs {
 	Text,
 	Binary
 }
+const memoizer = createMemoizer();
 
 /**
  * A file editor input is the input type for the file editor of file system resources.
@@ -34,7 +35,6 @@ export class FileEditorInput extends EditorInput implements IFileEditorInput {
 	private forceOpenAs: ForceOpenAs = ForceOpenAs.None;
 
 	private textModelReference: Promise<IReference<ITextEditorModel>> | null = null;
-	private name: string;
 
 	/**
 	 * An editor input who's contents are retrieved from file services.
@@ -69,6 +69,7 @@ export class FileEditorInput extends EditorInput implements IFileEditorInput {
 		this._register(this.textFileService.models.onModelSaved(e => this.onDirtyStateChange(e)));
 		this._register(this.textFileService.models.onModelReverted(e => this.onDirtyStateChange(e)));
 		this._register(this.textFileService.models.onModelOrphanedChanged(e => this.onModelOrphanedChanged(e)));
+		this._register(this.labelService.onDidChangeFormatters(() => memoizer.clear()));
 	}
 
 	private onDirtyStateChange(e: TextFileModelChangeEvent): void {
@@ -144,22 +145,22 @@ export class FileEditorInput extends EditorInput implements IFileEditorInput {
 		return FILE_EDITOR_INPUT_ID;
 	}
 
+	@memoizer
 	getName(): string {
-		if (!this.name) {
-			this.name = this.labelService.getUriBasenameLabel(this.resource);
-		}
-
-		return this.decorateLabel(this.name);
+		return this.decorateLabel(this.labelService.getUriBasenameLabel(this.resource));
 	}
 
+	@memoizer
 	private get shortDescription(): string {
 		return this.labelService.getUriBasenameLabel(dirname(this.resource));
 	}
 
+	@memoizer
 	private get mediumDescription(): string {
 		return this.labelService.getUriLabel(dirname(this.resource), { relative: true });
 	}
 
+	@memoizer
 	private get longDescription(): string {
 		return this.labelService.getUriLabel(dirname(this.resource));
 	}
@@ -176,17 +177,17 @@ export class FileEditorInput extends EditorInput implements IFileEditorInput {
 		}
 	}
 
-	@memoize
+	@memoizer
 	private get shortTitle(): string {
 		return this.getName();
 	}
 
-	@memoize
+	@memoizer
 	private get mediumTitle(): string {
 		return this.labelService.getUriLabel(this.resource, { relative: true });
 	}
 
-	@memoize
+	@memoizer
 	private get longTitle(): string {
 		return this.labelService.getUriLabel(this.resource);
 	}