Strange mouse button behavior

[WurdahMekanik]

As mentioned by @k9spud in issue #77, clicking the back button of my mouse will perform two back actions, and double-clicking any mouse button will open a folder in the main view area (not just the back button... although this is difficult to actually achieve with the right-button, and requires quickly moving the cursor off the context menu that pops up while attempting a double-right-click).

In addition to this, I can also single-click the forward or back buttons on my mouse to select folders in the tree view, although double-clicking the back button in the tree view seems to perform a back action.

I suspect that there's some filtering that needs to be done in order to determine which mouse button is actually being pressed when an event comes in.