Typing the letter t in the sprite editor executes trim?

Hi,
Having an issue that's driving me nuts. Hopefully this is the result of something dumb I've done.

I'm trying to go through and name sprites in a sprite sheet in the Unity sprite editor. I loaded up the sheet, and did a grid slice. Then I click on an individual sprite because I want to name it. In the name field, I type something like "DownLeft" - except when I type that last t, the bounds of my sprite collapse in. Apparently typing t at any point engages the trim tool? Is this a setting I've messed up or how it behaves now? Right now I'm typing names in notepad and copy/pasting them in as my only workaround.

Edit: This is 4.6.1.

 

Did you figure out the hot key commands?
Another workaround until you figure it out, you can probably use a capital T instead.

 

Download a newer version.

--Eric