https://github.com/mate-desktop/mate-calc/issues/239
https://github.com/mate-desktop/mate-calc/pull/240

From 220027f5ab946a1ca38f9888fdbe64630106aecc Mon Sep 17 00:00:00 2001
From: mbkma <johannes.unruh@fau.de>
Date: Sun, 19 Apr 2026 11:32:51 +0200
Subject: [PATCH] Set imaginary component to +0*i when inverting a real number

see https://gitlab.gnome.org/GNOME/gnome-calculator/-/merge_requests/457
---
 src/mp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/mp.c b/src/mp.c
index 31a84d4d..08e7afce 100644
--- a/src/mp.c
+++ b/src/mp.c
@@ -398,6 +398,10 @@ void
 mp_invert_sign(const MPNumber *x, MPNumber *z)
 {
     mpc_neg(z->num, x->num, MPC_RNDNN);
+    if (!mp_is_complex(x))
+    {
+        mpfr_set_zero(mpc_imagref(z->num), MPFR_RNDN);
+    }
 }
 
 void