fix vscode #32681

Author: Jeyanthinath

extensions/git/src/commands.ts

@@ -550,8 +550,10 @@ export class CommandCenter {
 		const originalDocument = await workspace.openTextDocument(originalUri);
 		const selections = textEditor.selections;
 		const selectedDiffs = diffs.filter(diff => {
-			const modifiedRange = diff.modifiedEndLineNumber === 0
-				? new Range(modifiedDocument.lineAt(diff.modifiedStartLineNumber - 1).range.end, modifiedDocument.lineAt(diff.modifiedStartLineNumber).range.start)
+			const modifiedRange =  diff.modifiedEndLineNumber === 0
+				? diff.modifiedStartLineNumber === 0
+					? new Range(modifiedDocument.lineAt(diff.modifiedStartLineNumber).range.end, modifiedDocument.lineAt(diff.modifiedStartLineNumber).range.start)
+					: new Range(modifiedDocument.lineAt(diff.modifiedStartLineNumber - 1).range.end, modifiedDocument.lineAt(diff.modifiedStartLineNumber).range.start)
 				: new Range(modifiedDocument.lineAt(diff.modifiedStartLineNumber - 1).range.start, modifiedDocument.lineAt(diff.modifiedEndLineNumber - 1).range.end);
 
 			return selections.every(selection => !selection.intersection(modifiedRange));