Using the WikiEditor that came with MW 1.27.0 (not sure how to check what the WE ver. is), when I enable the enhanced toolbar, the line spacing in the editing box is increased so it looks like 1.3 or 1.5 line spacing. With the normal toolbar the spacing looks like I'd expect (single spacing I assume), but with the enhanced toolbar the spacing looks too big.
Along with the bigger spacing looking "weird" and making text harder to read (courier don't work well with big line spacing), it also makes it difficult to tell how many lines are between text in sections with double (or more) line breaks.
Don't know if it makes a difference that I use MonoBook (without the WYSIWYG).
But, enough rambling: Is there a way to adjust the linespacing (and where do I look)?