fix microsoft#101384

jrieken · jrieken · commit b0c81f44d489 · 2020-07-06T10:53:38.000+02:00
diff --git a/src/vs/editor/common/model/mirrorTextModel.ts b/src/vs/editor/common/model/mirrorTextModel.ts
@@ -31,13 +31,15 @@ export class MirrorTextModel {
 	protected _eol: string;
 	protected _versionId: number;
 	protected _lineStarts: PrefixSumComputer | null;
+	private _cachedTextValue: string | null;
 
 	constructor(uri: URI, lines: string[], eol: string, versionId: number) {
 		this._uri = uri;
 		this._lines = lines;
 		this._eol = eol;
 		this._versionId = versionId;
 		this._lineStarts = null;
+		this._cachedTextValue = null;
 	}
 
 	dispose(): void {
@@ -49,7 +51,10 @@ export class MirrorTextModel {
 	}
 
 	getText(): string {
-		return this._lines.join(this._eol);
+		if (this._cachedTextValue === null) {
+			this._cachedTextValue = this._lines.join(this._eol);
+		}
+		return this._cachedTextValue;
 	}
 
 	onEvents(e: IModelChangedEvent): void {
@@ -66,6 +71,7 @@ export class MirrorTextModel {
 		}
 
 		this._versionId = e.versionId;
+		this._cachedTextValue = null;
 	}
 
 	protected _ensureLineStarts(): void {

Original file line number	Diff line number	Diff line change
`@@ -31,13 +31,15 @@ export class MirrorTextModel {`
`31`	`31`	`protected _eol: string;`
`32`	`32`	`protected _versionId: number;`
`33`	`33`	`protected _lineStarts: PrefixSumComputer \| null;`
	`34`	`+ private _cachedTextValue: string \| null;`
`34`	`35`
`35`	`36`	`constructor(uri: URI, lines: string[], eol: string, versionId: number) {`
`36`	`37`	`this._uri = uri;`
`37`	`38`	`this._lines = lines;`
`38`	`39`	`this._eol = eol;`
`39`	`40`	`this._versionId = versionId;`
`40`	`41`	`this._lineStarts = null;`
	`42`	`+ this._cachedTextValue = null;`
`41`	`43`	`}`
`42`	`44`
`43`	`45`	`dispose(): void {`
`@@ -49,7 +51,10 @@ export class MirrorTextModel {`
`49`	`51`	`}`
`50`	`52`
`51`	`53`	`getText(): string {`
`52`		`- return this._lines.join(this._eol);`
	`54`	`+ if (this._cachedTextValue === null) {`
	`55`	`+ this._cachedTextValue = this._lines.join(this._eol);`
	`56`	`+ }`
	`57`	`+ return this._cachedTextValue;`
`53`	`58`	`}`
`54`	`59`
`55`	`60`	`onEvents(e: IModelChangedEvent): void {`
`@@ -66,6 +71,7 @@ export class MirrorTextModel {`
`66`	`71`	`}`
`67`	`72`
`68`	`73`	`this._versionId = e.versionId;`
	`74`	`+ this._cachedTextValue = null;`
`69`	`75`	`}`
`70`	`76`
`71`	`77`	`protected _ensureLineStarts(): void {`