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I'm using undo-tree with AUCTeX, and I am persisting my undo files like so:
(setq undo-tree-auto-save-history t)
Unfortunately, this regularly results in large (~1MB) undo save files which cause my Emacs to hang when they're loaded. The reason for this is the large number of text-properties that AUCTeX puts on its buffer contents, which bloats the file by orders of magnitude.
Is it safe to remove these properties from the save file, and if so, how can I do so?
Here is the solution I eventually came up with. (Thanks to @phils for optimizations). As far as I can tell, it seems to be working without issues.
(defun nadvice/undo-tree-ignore-text-properties (old-fun &rest args)
(dolist (item buffer-undo-list)
(and (consp item)
(stringp (car item))
(setcar item (substring-no-properties (car item)))))
(apply old-fun args))
(advice-add 'undo-list-transfer-to-tree :around
#'nadvice/undo-tree-ignore-text-properties)
undo-tree, but my reading ofbuffer-undo-listindicates that text (and therefore text properties) should exist only for deletions, where the car of the entry is the text in question. So you might try using or adapting something like this?(dolist (x buffer-undo-list) (and (consp x) (stringp (car x)) (setcar x (substring-no-properties (car x)))))