fix: inline completion not displaying(microsoft#184108)

Author: yshaojun

src/vs/editor/contrib/inlineCompletions/browser/singleTextEdit.ts

@@ -70,10 +70,13 @@ export class SingleTextEdit {
 			const suggestionAddedIndentationLength = getLeadingWhitespace(edit.text).length;
 
 			const replacedIndentation = sourceLine.substring(edit.range.startColumn - 1, sourceIndentationLength);
-			const rangeThatDoesNotReplaceIndentation = Range.fromPositions(
-				edit.range.getStartPosition().delta(0, replacedIndentation.length),
-				edit.range.getEndPosition()
-			);
+
+			const [startPosition, endPosition] = [edit.range.getStartPosition(), edit.range.getEndPosition()];
+			const newStartPosition =
+				startPosition.column + replacedIndentation.length <= endPosition.column
+					? startPosition.delta(0, replacedIndentation.length)
+					: endPosition;
+			const rangeThatDoesNotReplaceIndentation = Range.fromPositions(newStartPosition, endPosition);
 
 			const suggestionWithoutIndentationChange =
 				edit.text.startsWith(replacedIndentation)