note
jonadab
<blockquote>Folding: I didn't know that is is possible with emacs</blockquote>
Yes, it is. Splitting the window is more useful, especially when combined with markers (and functions that automatically rotate point between several markers), but folding is also available. There's a minor mode for it, for instance (see, IIRC, folding.el). You can also see a great example of folding in action in Gnus: if you're reading an email message with nested quoting, and you middle click the highlighted portion of an attribution line (or position your cursor there and hit RET, I think), that user's comments are folded or unfolded.
I don't think cperl-mode does anything Perl-specific with folding, though.
<blockquote>Multidocument: yes (not the classic MDI, but recursively split screen horizontally and vertically and change sizes of windows)</blockquote>
That description almost makes it sound as if you can only have as many documents open as you can find space on the screen for at once.
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