Fix issues with graphs not showing up (#998)

The graphs were not showing up due to an issue with the global min width
not being defined properly.
Also fixed an issue with the viewfinder being too thin if the minimap
was less than a screen wide.

activity_browser/static/javascript/navigator.js

@@ -31,6 +31,9 @@ function getWindowSize() {
 
     globalWidth = x;
     globalHeight = y;
+    if (!globalMinWidth) {
+        globalMinWidth = globalWidth * 0.99;
+    }
     return {x,y};
 };
 
@@ -242,7 +245,6 @@ d3.demo.canvas = function() {
             // get panCanvas width here?
             // pan to node (implement here)
             minimap.render();
-
             updateDimensions(minimap.width());
             canvas.render();
             canvas.reset();
@@ -421,7 +423,7 @@ d3.demo.minimap = function() {
             d3.select(node).attr("transform", "translate(0,0)");
             // keep the minimap's viewport (frame) sized to match the current visualization viewport dimensions
             frame.select(".background")
-                .attr("width", minimap.width())
+                .attr("width", Math.max(minimap.width(), globalWidth))
                 .attr("height", height);
             frame.node().parentNode.appendChild(frame.node());
         };