src/vs/workbench/contrib/debug/browser/breakpointEditorContribution.ts/BreakpointEditorContribution/ensureBreakpointHintDecoration
class BreakpointEditorContribution:	private ensureBreakpointHintDecoration(showBreakpointHintAtLineNumber: number): void {
		const newDecoration: IModelDeltaDecoration[] = [];
		if (showBreakpointHintAtLineNumber !== -1) {
			newDecoration.push({
				options: breakpointHelperDecoration,
				range: {
					startLineNumber: showBreakpointHintAtLineNumber,
					startColumn: 1,
					endLineNumber: showBreakpointHintAtLineNumber,
					endColumn: 1
				}
			});
		}

		this.breakpointHintDecoration = this.editor.deltaDecorations(this.breakpointHintDecoration, newDecoration);
	}