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[62.77.231.86]) by smtp.gmail.com with ESMTPSA id g21-20020a05600c311500b0040651505684sm3142994wmo.29.2023.10.26.10.04.43 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 26 Oct 2023 10:04:43 -0700 (PDT) Content-Language: en-US Received-SPF: pass client-ip=2a00:1450:4864:20::429; envelope-from=geza.herman@gmail.com; helo=mail-wr1-x429.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.bugs:273305 Archived-At: The bug is, that in certain circumstances, emacs moves the point by using some kind of scrolling for "(goto-char (point-max))", instead of just jumping. Repro: - create a file using the little C program at the end (it produces a large text to stdout, you'll need to redirect it to some file) - open the file with "emacs -Q generated.txt" - with M-:, execute this:    (progn      (setq scroll-conservatively 101)      (font-lock-add-keywords nil '(((lambda (bound)) (1 'error prepend t))) t)      (goto-char (point-max))) Notice that emacs doesn't jump to the end immediately as usual, but it does some kind of very fast scrolling. (With long-line-threshold set to nil, the issue doesn't happen) In my real case, a much smaller file produces this problem. Also, Emacs doesn't go to the end of the file, but stops somewhere in the middle (I was unable to reproduce this issue with a simple configuration). So to go to the end of the file I have to run "(goto-char (point-max))" multiple times. Interestingly, "M->" works fine. But if I remove the recenter call at the end of "end-of-buffer", it also has this odd behavior. Here is the C program: #include #include int main() {     for (int i=0; i<200000; i++) {         int len = 100 + (rand()&0x7f);         if (i==5000) len = 60000;         for (int j=0; j