Bug: Backspacing in filter box

Hi,

I noticed that hitting the Backspace key when focused on the filter text box causes the directory to move up a level (as it would when focused on the main listing pane).  It should, simply, erase the previous character in the filter text box.  I really like the filtering feature, but this bug makes its use in TabbyFile very frustrating, almost unusable.

Also, could there be a "Clear Filter" button that appears if a filter is activated?

Right now the only way I can see to remove a filter is to erase (and not use Backspace to do it!) the contents of the filter text box, then hit enter/click the icon.

Otherwise, I love TabbyFile and am continuing to evangelize it on the web...