From 79fcb5d4bd6363d5519283f837d0879d7dd4e00e Mon Sep 17 00:00:00 2001
From: Giles Atkinson <“gatk555@gmail.com”>
Date: Tue, 28 Feb 2023 17:31:35 +0000
Subject: [PATCH] Fix plotting bug reported by Robert Turnbull: ngspice-devel
 2023-02-10.

---
 src/frontend/plotting/graf.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/frontend/plotting/graf.c b/src/frontend/plotting/graf.c
index 2e9a70797..929a6e5fb 100644
--- a/src/frontend/plotting/graf.c
+++ b/src/frontend/plotting/graf.c
@@ -485,12 +485,15 @@ void gr_point(struct dvec *dv,
     case PLOT_RETLIN:
         /* If it's a linear plot, ignore first point since we don't
            want to connect with oldx and oldy. */
-        if (np)
+        if (np) {
 #ifdef LINE_COMPRESSION_CHECKS
             drawLine(fromx, fromy, tox, toy, dv);
 #else
             drawLine(fromx, fromy, tox, toy);
 #endif
+        } else {
+            LC_flush(); // May be retrace with non-monotonic x-axis
+        }
 
         if ((tics = currentgraph->ticdata) != NULL) {
             for (; *tics < HUGE; tics++)