Clarify usage of TextModel.isTooLargeForHavingAMode() (#30180)

src/vs/editor/common/editorCommon.ts

@@ -688,13 +688,6 @@ export interface ITextModel {
 	 */
 	isDisposed(): boolean;
 
-	/**
-	 * No mode supports allowed on this model because it is simply too large.
-	 * (even tokenization would cause too much memory pressure)
-	 * @internal
-	 */
-	isTooLargeForHavingAMode(): boolean;
-
 	/**
 	 * Only basic mode supports allowed on this model because it is simply too large.
 	 * (tokenization is allowed and other basic supports)

src/vs/editor/common/model/textModel.ts

@@ -94,7 +94,7 @@ export class TextModel implements editorCommon.ITextModel {
 	protected _mightContainNonBasicASCII: boolean;
 
 	private _shouldSimplifyMode: boolean;
-	private _shouldDenyMode: boolean;
+	protected readonly _isTooLargeForTokenization: boolean;
 
 	constructor(rawTextSource: IRawTextSource, creationOptions: editorCommon.ITextModelCreationOptions) {
 		this._eventEmitter = new OrderGuaranteeEventEmitter();
@@ -102,7 +102,11 @@ export class TextModel implements editorCommon.ITextModel {
 		const textModelData = TextModel.resolveCreationData(rawTextSource, creationOptions);
 
 		this._shouldSimplifyMode = (textModelData.text.length > TextModel.MODEL_SYNC_LIMIT);
-		this._shouldDenyMode = (textModelData.text.length > TextModel.MODEL_TOKENIZATION_LIMIT);
+
+		// !!! Make a decision in the ctor and permanently respect this decision !!!
+		// If a model is too large at construction time, it will never get tokenized,
+		// under no circumstances.
+		this._isTooLargeForTokenization = (textModelData.text.length > TextModel.MODEL_TOKENIZATION_LIMIT);
 
 		this._options = new editorCommon.TextModelResolvedOptions(textModelData.options);
 		this._constructLines(textModelData.text);
@@ -117,11 +121,6 @@ export class TextModel implements editorCommon.ITextModel {
 		}
 	}
 
-	public isTooLargeForHavingAMode(): boolean {
-		this._assertNotDisposed();
-		return this._shouldDenyMode;
-	}
-
 	public isTooLargeForHavingARichMode(): boolean {
 		this._assertNotDisposed();
 		return this._shouldSimplifyMode;

src/vs/editor/common/model/textModelWithTokens.ts

@@ -119,7 +119,7 @@ export class TextModelWithTokens extends TextModel implements editorCommon.IToke
 		}
 
 		this._tokenizationSupport = null;
-		if (!this.isTooLargeForHavingAMode()) {
+		if (!this._isTooLargeForTokenization) {
 			this._tokenizationSupport = TokenizationRegistry.get(this._languageIdentifier.language);
 		}