Create one-time mouseup listener for each mousedown (#1697)

Create mouse up listener for each mouse down

Author: scuml

debug_toolbar/static/debug_toolbar/js/toolbar.js

@@ -188,20 +188,25 @@ const djdt = {
                 startPageY = event.pageY;
                 baseY = handle.offsetTop - startPageY;
                 document.addEventListener("mousemove", onHandleMove);
+
+                document.addEventListener(
+                    "mouseup",
+                    function (event) {
+                        document.removeEventListener("mousemove", onHandleMove);
+                        if (djdt.handleDragged) {
+                            event.preventDefault();
+                            localStorage.setItem("djdt.top", handle.offsetTop);
+                            requestAnimationFrame(function () {
+                                djdt.handleDragged = false;
+                            });
+                            djdt.ensureHandleVisibility();
+                        }
+                    },
+                    { once: true }
+                );
             }
         );
 
-        document.addEventListener("mouseup", function (event) {
-            document.removeEventListener("mousemove", onHandleMove);
-            if (djdt.handleDragged) {
-                event.preventDefault();
-                localStorage.setItem("djdt.top", handle.offsetTop);
-                requestAnimationFrame(function () {
-                    djdt.handleDragged = false;
-                });
-                djdt.ensureHandleVisibility();
-            }
-        });
         const djDebug = getDebugElement();
         // Make sure the debug element is rendered at least once.
         // showToolbar will continue to show it in the future if the