This has been true for a long while, but I haven't read any mention of
Is it not the case that the sense of the Split Vertically and Split
Horizontally commands is reversed in IDEA? The direction is supposed to
refer to the orientation of the split bar, NOT the way the panes are
oriented. Thus "split vertically" means the spit bar is vertical and
the two panes are side-by-side. "Split horizontally" means the split bar
is horizontal and the two panes are top-to-bottom.
I noticed this some time ago, but just wrote it off as one of IDEA's
little UI eccentricities (another is the fact that the sort-order
indicator in table columns is also reversed from its usage in other
applications--an ascending sort is supposed to have the apex at the top,
not the bottom). But in the new Allow LAF, I noticed that the menu icons
associated with the Split commands contradict the way IDEA actually
implements the commands, so I thought I'd mention it.