Fixed camera zoom killing coordinate hover unnecessarily.

app/lib/surface/Camera.coffee

@@ -283,8 +283,9 @@ module.exports = class Camera extends CocoClass
       target = @boundTarget @target, @zoom
       return if not force and _.isEqual target, @currentTarget
     @currentTarget = target
-    @updateViewports target
-    Backbone.Mediator.publish 'camera:zoom-updated', camera: @, zoom: @zoom, surfaceViewport: @surfaceViewport
+    viewportDifference = @updateViewports target
+    if viewportDifference > 0.1  # Roughly 0.1 pixel difference in what we can see
+      Backbone.Mediator.publish 'camera:zoom-updated', camera: @, zoom: @zoom, surfaceViewport: @surfaceViewport
 
   boundTarget: (pos, zoom) ->
     # Given an {x, y} in Surface coordinates, return one that will keep our viewport on the Surface.
@@ -303,6 +304,11 @@ module.exports = class Camera extends CocoClass
     sv = width: @canvasWidth / @zoom, height: @canvasHeight / @zoom, cx: target.x, cy: target.y
     sv.x = sv.cx - sv.width / 2
     sv.y = sv.cy - sv.height / 2
+    if @surfaceViewport
+      # Calculate how different this viewport is. (If it's basically not different, we can avoid visualizing the update.)
+      viewportDifference = Math.abs(@surfaceViewport.x - sv.x) + 1.01 * Math.abs(@surfaceViewport.y - sv.y) + 1.02 * Math.abs(@surfaceViewport.width - sv.width)
+    else
+      viewportDifference = 9001
     @surfaceViewport = sv
 
     wv = @surfaceToWorld sv  # get x and y
@@ -312,6 +318,8 @@ module.exports = class Camera extends CocoClass
     wv.cy = wv.y + wv.height / 2
     @worldViewport = wv
 
+    viewportDifference
+
   lock: ->
     @target = @currentTarget
     @locked = true

app/lib/surface/CoordinateDisplay.coffee

@@ -16,6 +16,7 @@ module.exports = class CoordinateDisplay extends createjs.Container
     console.error @toString(), 'needs a camera.' unless @camera
     console.error @toString(), 'needs a layer.' unless @layer
     @build()
+    @performShow = @show
     @show = _.debounce @show, 125
     Backbone.Mediator.subscribe(channel, @[func], @) for channel, func of @subscriptions
 
@@ -46,6 +47,7 @@ module.exports = class CoordinateDisplay extends createjs.Container
     wop.y = Math.round(wop.y)
     return if wop.x is @lastPos?.x and wop.y is @lastPos?.y
     @lastPos = wop
+    @lastScreenPos = x: e.x, y: e.y
     @hide()
     @show()  # debounced
 
@@ -58,8 +60,11 @@ module.exports = class CoordinateDisplay extends createjs.Container
     Backbone.Mediator.publish 'surface:coordinate-selected', wop
 
   onZoomUpdated: (e) ->
-    @hide()
-    @show()
+    return unless @lastPos
+    wop = @camera.screenToWorld @lastScreenPos
+    @lastPos.x = Math.round wop.x
+    @lastPos.y = Math.round wop.y
+    @performShow() if @label.parent
 
   onFlagColorSelected: (e) ->
     @placingFlag = Boolean e.color

server/commons/Handler.coffee

@@ -10,7 +10,7 @@ hipchat = require '../hipchat'
 deltasLib = require '../../app/lib/deltas'
 
 PROJECT = {original: 1, name: 1, version: 1, description: 1, slug: 1, kind: 1, created: 1, permissions: 1}
-FETCH_LIMIT = 500
+FETCH_LIMIT = 1000  # So many ThangTypes
 
 module.exports = class Handler
   # subclasses should override these properties