src/vs/workbench/contrib/debug/browser/breakpointEditorContribution.ts/BreakpointEditorContribution/ensureBreakpointHintDecoration
class BreakpointEditorContribution:	private ensureBreakpointHintDecoration(showBreakpointHintAtLineNumber: number): void {
		this.editor.changeDecorations((accessor) => {
			if (this.breakpointHintDecoration) {
				accessor.removeDecoration(this.breakpointHintDecoration);
				this.breakpointHintDecoration = null;
			}
			if (showBreakpointHintAtLineNumber !== -1) {
				this.breakpointHintDecoration = accessor.addDecoration({
					startLineNumber: showBreakpointHintAtLineNumber,
					startColumn: 1,
					endLineNumber: showBreakpointHintAtLineNumber,
					endColumn: 1
				}, breakpointHelperDecoration
				);
			}
		});
	}