Merge pull request #2043 from openseadragon/ms-passivewheel

Explicitly set passive:false for wheel event handlers to supress console warnings

changelog.txt

@@ -55,6 +55,7 @@ OPENSEADRAGON CHANGELOG
 * Now ensuring that the new item is already in the navigator when the "add-item" event fires (#2005 @RammasEchor)
 * Added keys to change image in sequence mode (j: previous, k: next) (#2007 @RammasEchor)
 * Fixed a bug where the navigator wouldn't pick up opacity/composite changes made while it is loading (#2018 @crydell)
+* Explicitly set passive:false for wheel event handlers to suppress console warnings. Fixes #1669 (#2043 @msalsbery)
 * Viewer's canvas-click events now include an originalTarget property so you can know which element received the click (#2037 @iangilman)
 
 2.4.2:

src/mousetracker.js

@@ -1465,7 +1465,7 @@
                     tracker.element,
                     event,
                     delegate[ event ],
-                    false
+                    event === $.MouseTracker.wheelEventName ? { passive: false, capture: false } : false
                 );
             }