new plugin - to show less portals when zoomed out

modified show-more-portals so it works with other zoom-modification plugins

plugins/show-more-portals.user.js

@@ -6,7 +6,7 @@
 // @namespace      https://github.com/jonatkins/ingress-intel-total-conversion
 // @updateURL      @@UPDATEURL@@
 // @downloadURL    @@DOWNLOADURL@@
-// @description    [@@BUILDNAME@@-@@BUILDDATE@@] Boost the detail level of portals shown on the map by one zoom level. Good for small screens. Likely to increase request failed errors on larger screens.
+// @description    [@@BUILDNAME@@-@@BUILDDATE@@] Boost the detail level of portals shown on the map by one zoom level when zoomed in close (L2+ portals or closer)
 // @include        https://www.ingress.com/intel*
 // @include        http://www.ingress.com/intel*
 // @match          https://www.ingress.com/intel*
@@ -24,18 +24,26 @@ window.plugin.showMorePortals = function() {};
 
 window.plugin.showMorePortals.setup  = function() {
 
-  // replace the window.getPortalDataZoom function
+  // save the original function - so we can chain to it for levels we don't modify
+  var origGetPortalDataZoom = window.getPortalDataZoom;
+
+  // replace the window.getPortalDataZoom function - modify behaviour when zoomed close
 
   window.getPortalDataZoom = function() {
     var mapZoom = map.getZoom();
 
+    // this plugin only cares about close in zoom levels (zoom 13 and higher) - run the original
+    // code when this isn't the case. (this way, multiple zoom-modifying plugins can exist at once - in theory)
+    if (mapZoom < 13) {
+      return origGetPortalDataZoom();
+    }
+
     // make sure we're dealing with an integer here
     // (mobile: a float somehow gets through in some cases!)
     var z = parseInt(mapZoom);
 
-    // boost data zoom level by one when reasonably close (past the zoom<=12 point of the smaller
-    // getThinnedEntitiesV4 tiles, to avoid excessive requests further out)
-    if (mapZoom >= 13) z += 1;
+    // boost data zoom level by one
+    z += 1;
 
     // not recommended on anything other than the very smallest of screens
 //    // show unclaimed portals at an additional zoom level further than by default
@@ -53,9 +61,6 @@ window.plugin.showMorePortals.setup  = function() {
       z = z-1;
     }
 
-    //sanity check - should never happen
-    if (z < 0) z=0;
-
     return z;
   }