From: Eli Zaretskii <eliz@gnu.org>
Date: Sat, 31 Aug 2024 09:58:39 +0000 (+0300)
Subject: Work around Gnuplot bug in displaying plots
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=bb8824f2eb8fc5f21da3553e755b7159ccc57cd5;p=emacs.git

Work around Gnuplot bug in displaying plots

* lisp/calc/calc-graph.el (calc-gnuplot-command): Prepend newline
to Gnuplot command.  Suggested by Visuwesh <visuweshm@gmail.com>.
(Bug#72778)

(cherry picked from commit bb5576fc9071590143af2106111d95ca2221a20c)
---

diff --git a/lisp/calc/calc-graph.el b/lisp/calc/calc-graph.el
index c355b37346c..026e0b5c8a7 100644
--- a/lisp/calc/calc-graph.el
+++ b/lisp/calc/calc-graph.el
@@ -1417,7 +1417,9 @@ This \"dumb\" driver will be present in Gnuplot 3.0."
   "Send ARGS to Gnuplot.
 Returns nil if Gnuplot signaled an error."
   (calc-graph-init)
-  (let ((cmd (concat (mapconcat 'identity args " ") "\n")))
+  ;; We prepend the newline to work around a bug in Gnuplot, whereby it
+  ;; sometimes does not display the plot, see bug#72778.
+  (let ((cmd (concat "\n" (mapconcat 'identity args " ") "\n")))
     (or (calc-graph-w32-p)
 	(accept-process-output))
     (with-current-buffer calc-gnuplot-buffer