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bug#23823: 25.0.95; Reset between highlight buffer/file comparisons

From: Tino Calancha
Subject: bug#23823: 25.0.95; Reset between highlight buffer/file comparisons
Date: Fri, 24 Jun 2016 22:13:25 +0900 (JST)
User-agent: Alpine 2.20 (DEB 67 2015-01-07)

On Fri, 24 Jun 2016, Eli Zaretskii wrote:

But the function's doc string clearly makes that expected behavior:

 If the current buffer is visiting the file being compared against, it
 also will have its differences highlighted.

The only way I can interpret that "also" part is that the changes
against the file are highlighted _in_addition_ to the changes tracked
by the mode.  Your scenario just happens to produce a clash between
these two sets of differences, and the result could be ambiguous.  But
what we get in fact doesn't seem unreasonable to me.

You convinced me: there is no need to reset those highlighted differences.
If the user want to do that he/she could toggle eaasily the mode before calling the func. Adding a prefix argument to reset may cause accidentaly
lost all the tracked differences.

The comentary of this lib helps to understand the design intentions.
For example when it says:
;; You can "age" different sets of changes by using
;; `highlight-changes-rotate-faces'.

Each time the buffer is saved, the new differences get a different face.

Following example shows the point:

emacs -Q -eval "(progn (with-temp-file \"/tmp/foo\" (insert \"Hi i am foo\n\")) (find-file 
\"/tmp/foo\") (highlight-changes-mode 1) (add-hook 'write-file-functions 'highlight-changes-rotate-faces nil 
M-: (progn (goto-char (point-max)) (insert "Hi foo, i am bar.\n") 
(highlight-compare-with-file "/tmp/foo")) RET y y
M-: (progn (goto-char (point-max)) (insert "Nice to meet you foo.\n") 
(highlight-compare-with-file "/tmp/foo")) RET y y
M-: (progn (goto-char (point-max)) (insert "Nice to meet you too, bar.\n") 
(highlight-compare-with-file "/tmp/foo")) RET y y

;; If we reset the buffer on each func call we will loose all this
;; psicodelic color structure :-S

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