From 1b5e919fe63f6e683233d4cf5ea825478c2887b9 Mon Sep 17 00:00:00 2001
From: Marwin Hochfelsner <50826859+hlfan@users.noreply.github.com>
Date: Sun, 18 Jan 2026 23:00:27 +0100
Subject: [PATCH] Fix month label index desync causing missing labels

---
 app/assets/javascripts/heatmap.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/app/assets/javascripts/heatmap.js b/app/assets/javascripts/heatmap.js
index fc7ed85e5..c60b6bf90 100644
--- a/app/assets/javascripts/heatmap.js
+++ b/app/assets/javascripts/heatmap.js
@@ -3,6 +3,7 @@ $(document).on("turbo:frame-load", function () {
   const weekInfo = getWeekInfo();
   const maxPerDay = heatmap.data("max-per-day");
   const weekdayLabels = heatmap.find("[data-weekday]");
+  const monthLabelStartIndex = Math.min(...heatmap.find("[data-month]").get().map(l => l.dataset.month));
   let weekColumn = 1;
   let previousMonth = null;
 
@@ -24,7 +25,7 @@ $(document).on("turbo:frame-load", function () {
       weekColumn++;
       const currentMonth = getMonthOfThisWeek(date);
       if (previousMonth === null) {
-        previousMonth = currentMonth;
+        previousMonth = currentMonth + (Math.round((monthLabelStartIndex - currentMonth) / 12) * 12);
         heatmap.find(`[data-month]:has( ~ [data-month="${previousMonth}"])`).remove();
         heatmap.find("[data-month]").first().css("grid-column-start", 2);
       }
-- 
2.39.5