nes: refactor: extract cursorLineOffset

Author: ulugbekna

src/extension/xtab/node/xtabCurrentDocument.ts

@@ -12,11 +12,17 @@ export class CurrentDocument {
 	public readonly lines: Lazy<string[]>;
 	public readonly cursorOffset: number;
 
+	/**
+	 * The 0-based line number of the cursor.
+	 */
+	public readonly cursorLineOffset: number;
+
 	constructor(
 		public readonly content: StringText,
 		public readonly cursorPosition: Position,
 	) {
 		this.lines = new Lazy(() => content.getLines());
 		this.cursorOffset = content.getTransformer().getOffset(cursorPosition);
+		this.cursorLineOffset = this.cursorPosition.lineNumber - 1;
 	}
 }

src/extension/xtab/node/xtabProvider.ts

@@ -232,20 +232,18 @@ export class XtabProvider implements IStatelessNextEditProvider {
 
 		const currentDocument = new CurrentDocument(activeDocument.documentAfterEdits, cursorPosition);
 
-		const cursorLineIdx = cursorPosition.lineNumber - 1 /* to convert to 0-based */;
-
-		const cursorLine = currentDocument.lines.value[cursorLineIdx];
+		const cursorLine = currentDocument.lines.value[currentDocument.cursorLineOffset];
 		const isCursorAtEndOfLine = cursorPosition.column === cursorLine.trimEnd().length;
 		if (isCursorAtEndOfLine) {
 			delaySession.setExtraDebounce(this.configService.getExperimentBasedConfig(ConfigKey.Internal.InlineEditsExtraDebounceEndOfLine, this.expService));
 		}
 		telemetryBuilder.setIsCursorAtLineEnd(isCursorAtEndOfLine);
 
-		const areaAroundEditWindowLinesRange = this.computeAreaAroundEditWindowLinesRange(currentDocument.lines.value, cursorLineIdx);
+		const areaAroundEditWindowLinesRange = this.computeAreaAroundEditWindowLinesRange(currentDocument.lines.value, currentDocument.cursorLineOffset);
 
-		const editWindowLinesRange = this.computeEditWindowLinesRange(currentDocument.lines.value, cursorLineIdx, request, retryState);
+		const editWindowLinesRange = this.computeEditWindowLinesRange(currentDocument.lines.value, currentDocument.cursorLineOffset, request, retryState);
 
-		const cursorOriginalLinesOffset = Math.max(0, cursorLineIdx - editWindowLinesRange.start);
+		const cursorOriginalLinesOffset = Math.max(0, currentDocument.cursorLineOffset - editWindowLinesRange.start);
 		const editWindowLastLineLength = activeDocument.documentAfterEdits.getTransformer().getLineLength(editWindowLinesRange.endExclusive);
 		const editWindow = activeDocument.documentAfterEdits.getTransformer().getOffsetRange(new Range(editWindowLinesRange.start + 1, 1, editWindowLinesRange.endExclusive, editWindowLastLineLength + 1));