fix drop from two touches to one

app/services/activity_service.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+class ActivityService
+
+  def self.send_activity_for_followers(map, reason_filter = nil)
+    follows = FollowService.get_follows_for_entity(map, nil, reason_filter)
+
+    # generate the full set of activity here
+
+    follows.each{|follow|
+      # check here whether this person needs to receive anything
+      # related to the activity that occurred on the map
+
+      body = NotificationService.renderer.render(template: 'template', locals: {}, layout: false)
+      follow.user.notify('subject', body, event, false, MAP_ACTIVITY, follow.user.emails_allowed, ??)
+    }
+  end
+  
+end

frontend/src/patched/JIT.js

@@ -2692,28 +2692,31 @@ Extras.Classes.Navigation = new Class({
         y: (e.touches[0].clientY + e.touches[1].clientY) / 2
       }
       if (30 >= desiredScale && desiredScale >= 0.2) {
-        //canvas.scale(scaler, scaler)
         Metamaps.Util.zoomOnPoint(this, scaler, midpoint)
+        jQuery(document).trigger(Metamaps.JIT.events.zoom)
       }
-      jQuery(document).trigger(Metamaps.JIT.events.zoom);
     }
   },
   
   onTouchEnd: function(e, win, eventInfo, isRightClick) {
     if(!this.config.panning) return;
-    this.pressed = false;
     if (e.touches.length === 1) {
       var canvas = this.canvas,
         ox = canvas.translateOffsetX,
         oy = canvas.translateOffsetY,
         sx = canvas.scaleOffsetX,
-        sy = canvas.scaleOffsetY
+        sy = canvas.scaleOffsetY,
         s = canvas.getSize();
       this.pos = {
         x: (e.touches[0].clientX - s.width/2 - ox) * 1/sx,
         y: (e.touches[0].clientY - s.height/2 - oy) * 1/sy
       };
+      this.pos.x *= sx;
+      this.pos.x += ox;
+      this.pos.y *= sy;
+      this.pos.y += oy;
     } else if (e.touches.length === 0) {
+      this.pressed = false;
       this.pos = null
       if (Metamaps.Mouse.didPan) Metamaps.JIT.SmoothPanning();
     }