From e9f824dbf2edccf86689303aee4b03a374ac1307 Mon Sep 17 00:00:00 2001
From: Doug Martin <dmartin@concord.org>
Date: Sat, 6 Apr 2024 07:06:41 -0400
Subject: [PATCH] fix: Negative probability slider [PT-187357469]

This ensures that no probability values can go below zero.
---
 src/components/drawing/probability-selector.tsx | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/components/drawing/probability-selector.tsx b/src/components/drawing/probability-selector.tsx
index ac48b8a..461a643 100644
--- a/src/components/drawing/probability-selector.tsx
+++ b/src/components/drawing/probability-selector.tsx
@@ -129,7 +129,10 @@ export const ProbabilitySelector = ({exactPercentages, edgeLabels, onChange}: Pr
     newExactPercentages[index] = newExactPercentage;
     newExactPercentages[index+1] = pairedPercentageSum - newExactPercentage;
 
-    onChange(newExactPercentages);
+    const allAboveZero = newExactPercentages.find(n => n < 0) === undefined;
+    if (allAboveZero) {
+      onChange(newExactPercentages);
+    }
   }, [exactPercentages, onChange]);
 
   if (exactPercentages.length < 2) {