Selection Handling

The selection handling code in both gridview.js and graphview.js includes a lot of variables not explicitly declared with "var." While this doesn't seem to cause problems at the moment, this is probably something that should be fixed.

Also, both files make use of the line

if (selectedItem != null && selectedTile != null) {

It's within that scope that many of the aforementioned variables are first used and set. Given that the code following that scope makes use of those values, the code as it now stands is banking on the fact that that if statement will never be false.