<p>Well, its a similar concept from differing domains, code editing, and tree viewing (commonly filesystems).</p>
<p>IME the former uses "fold/unfold" for the hiding of contiguous blocks of code whilst the latter uses "expand/collapse" for an information hierarchy.  Certainly the underlying widgets do so:</p>
<p><a href="http://www.scintilla.org/ScintillaDoc.html#Folding" rel="nofollow">http://www.scintilla.org/ScintillaDoc.html#Folding</a></p>
<p><a href="https://developer.gnome.org/gtk3/stable/GtkTreeView.html#gtk-tree-view-expand-all" rel="nofollow">https://developer.gnome.org/gtk3/stable/GtkTreeView.html#gtk-tree-view-expand-all</a></p>
<p>Emacs, Qt creator use fold/unfold, Eclipse does not have folds on the text buffer, but shows the structure in a tree view in a separate pane and uses expand/collapse in that tree view to fold/unfold the text, yes it uses both terms to describe the action.</p>
<p>I think its fine for Geany to follow the historical usage and leave both terms.</p>

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