fix: Mark atom-utils event listeners as passive

Marking event listeners as passive, indicates that the callback will
never call `event.preventDefault()`. This can greatly improve scrolling
performance.

For more information on passive event listeners see:
https://developers.google.com/web/updates/2016/06/passive-event-listeners

⚠️ This PR requires abe33/atom-utils#3 to
work correctly.

Co-authored-by: Lukas Geiger <lukas@plumerai.com>

lib/minimap-element.js

@@ -498,7 +498,7 @@ class MinimapElement {
     this.subscriptions.add(this.subscribeTo(this.getFrontCanvas(), {
       mousedown: (e) => { this.canvasPressed(this.extractMouseEventData(e)) },
       touchstart: (e) => { this.canvasPressed(this.extractTouchEventData(e)) }
-    }))
+    }, { passive: true }))
   }
 
   /**
@@ -515,7 +515,7 @@ class MinimapElement {
     this.visibleAreaSubscription = this.subscribeTo(this.visibleArea, {
       mousedown: (e) => { this.startDrag(this.extractMouseEventData(e)) },
       touchstart: (e) => { this.startDrag(this.extractTouchEventData(e)) }
-    })
+    }, { passive: true })
 
     this.subscriptions.add(this.visibleAreaSubscription)
   }

lib/minimap-quick-settings-element.js

@@ -117,7 +117,7 @@ class MinimapQuickSettingsElement {
 
     subs.add(this.subscribeTo(this.hiddenInput, {
       focusout: (e) => { this.destroy() }
-    }))
+    }, { passive: true }))
 
     subs.add(this.subscribeTo(this.onLeftButton, {
       mousedown: (e) => {