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    <p>Contrary to phils, I expect that your modified-p flag is not set by <code>set-buffer-modified-p</code> but rather by actual changes to the buffer. The reason this is possible is that text-properties are treated by Emacs as belonging to the content of the buffer, so changing them sets the modified-p flag, even tho in many cases the result is invisible and even if it is visible it is generally not perceived by the user as a <em>modification</em> (which users generally understand as something like "affects the file when I save the buffer").</p> <p>So, most of the code that sets text-properties needs to be careful to reset the modified-p flag afterwards. The best way to do that is usually by wrapping the code that sets the properties inside a <code>with-silent-modification</code>.</p> <p>One way try to track down the culprit is by trying to undo the modification (e.g. with <code>C-/</code>), but of course, if the modification is not visible, undoing it won't be visible either. So instead you may want to look at <code>C-h v buffer-undo-list RET</code> which is the internal data used to keep track of the modifications. With luck, not only was the modified-p set but the undo-list as well, and that list will tell you what was changed. For example, that list could look like <code>(nil (nil face nil 12345708 . 12345713))</code> which means that the change was to set the <code>face</code> property to a new value between positions 12345708 and 12345713 and that the old value of that property was <code>nil</code> (that's the 3rd <code>nil</code> in the above). Sometimes looking at the affected positions with <code>M-: (goto-char 12345708) RET</code> is sufficient to figure out who's to blame. Othertimes looking at <code>M-: (get-text-property 12345708 'face) RET</code>, which gives you the new value that was set, is more useful.</p>
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    1. POWho is setting the modified flag on my files in Emacs?
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    1. COI agree completely -- I'll be very surprised if my answer actually shows the culprit. It seemed worth eliminating it as a possible cause, though; and I couldn't think of an obvious way to debug the alternative :)
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    2. CO@phils You'd be stepping out pretty far on a limb to disagree with a maintainer! :)
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