[OS X TeX] how to correct a mistaken commmand

[Nitecki, Zbigniew H.]

This is a stupid questioon about a stupid mistake, luckily one with minor consequences.

While trying to make some order changes in a large block of text (in source code) Iinadvertently hit shift-option-% instead of shift-option-} (for commenting out).  This appeared to change the interline spacing in my source file.
Realizing my mistake, I went to  “Edit” (at the top of my screen—is that the toolbar?) and the option at the top
of the pulldown menu that appeared was “Undo raise baseline…..[command] Z” (I quote from slightly unreliable memory). So I hit that a few times, something changed, but I never got back to the original spacing.
I have no idea what raisning the baseline is supposed to do, but my question is:  how do I simply restore to the
original setting?  This only seems to affect the appearance of text in my source file, not the .pdf file, so it is an 
annoyance rather than an emergency.