From 84a69e0af1c6b1e36d4c1858470707c67e6547f0 Mon Sep 17 00:00:00 2001
From: Norbert Renner <norbert.renner@gmx.de>
Date: Fri, 21 May 2021 09:17:33 +0200
Subject: [PATCH] Patch Leaflet drag offset bug

---
 js/util/LeafletPatches.js | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 js/util/LeafletPatches.js

diff --git a/js/util/LeafletPatches.js b/js/util/LeafletPatches.js
new file mode 100644
index 0000000..bfdae9c
--- /dev/null
+++ b/js/util/LeafletPatches.js
@@ -0,0 +1,16 @@
+// Fixes wrong added offset when dragging, which can leave mouse off the marker
+// after dragging and cause a map click
+// see https://github.com/Leaflet/Leaflet/pull/7446
+// see https://github.com/Leaflet/Leaflet/issues/4457
+L.Draggable.prototype._onMoveOrig = L.Draggable.prototype._onMove;
+L.Draggable.prototype._onMove = function (e) {
+    var start = !this._moved;
+
+    this._onMoveOrig.call(this, e);
+
+    if (start && this._moved) {
+        var offset = this._newPos.subtract(this._startPos);
+        this._startPos = this._startPos.add(offset);
+        this._newPos = this._newPos.add(offset);
+    }
+};