Fixes microsoft#187063

Author: hediet

src/vs/editor/browser/editorBrowser.ts

@@ -1086,6 +1086,12 @@ export interface ICodeEditor extends editorCommon.IEditor {
 	hasModel(): this is IActiveCodeEditor;
 
 	setBanner(bannerDomNode: HTMLElement | null, height: number): void;
+
+	/**
+	 * Is called when the model has been set, view state was restored and options are updated.
+	 * This is the best place to render UI.
+	 */
+	handleInitialized?(): void;
 }
 
 /**

src/vs/editor/browser/widget/codeEditorWidget.ts

@@ -1021,6 +1021,10 @@ export class CodeEditorWidget extends Disposable implements editorBrowser.ICodeE
 		}
 	}
 
+	public handleInitialized(): void {
+		this._getViewModel()?.visibleLinesStabilized();
+	}
+
 	public onVisible(): void {
 		this._modelData?.view.refreshFocusState();
 	}

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

@@ -642,7 +642,7 @@ class AttachedViewHandler extends Disposable {
 	}
 
 	private update(): void {
-		if (equals(this._computedLineRanges, this._lineRanges)) {
+		if (equals(this._computedLineRanges, this._lineRanges, (a, b) => a.equals(b))) {
 			return;
 		}
 		this._computedLineRanges = this._lineRanges;

src/vs/monaco.d.ts

@@ -6065,6 +6065,11 @@ declare namespace monaco.editor {
 		 */
 		applyFontInfo(target: HTMLElement): void;
 		setBanner(bannerDomNode: HTMLElement | null, height: number): void;
+		/**
+		 * Is called when the model has been set, view state was restored and options are updated.
+		 * This is the best place to render UI.
+		 */
+		handleInitialized?(): void;
 	}
 
 	/**

src/vs/workbench/contrib/files/browser/editors/textFileEditor.ts

@@ -148,6 +148,10 @@ export class TextFileEditor extends AbstractTextCodeEditor<ICodeEditorViewState>
 			// a resolved model might have more specific information about being
 			// readonly or not that the input did not have.
 			control.updateOptions(this.getReadonlyConfiguration(textFileModel.isReadonly()));
+
+			if (control.handleInitialized) {
+				control.handleInitialized();
+			}
 		} catch (error) {
 			await this.handleSetInputError(error, input, options);
 		}