[gnumeric] Style: fix merging problem.

[Morten Welinder <mortenw src gnome org>]

commit 2b2e49a64c76832cbac6d9f9b4ab355a08e1f9f2
Author: Morten Welinder <terra gnome org>
Date:   Wed Jan 19 17:29:24 2022 -0500

    Style: fix merging problem.

 ChangeLog    | 1 +
 src/mstyle.c | 1 +
 2 files changed, 2 insertions(+)
---
diff --git a/ChangeLog b/ChangeLog
index 442e79a63..ea9be2ee8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,6 +2,7 @@
 
        * src/mstyle.c (gnm_style_linked_sheet_changed): Add missing ref.
        Fixes #597.
+       (gnm_style_merge): Mark elements from overlay as set in base.
 
 2022-01-09  Morten Welinder  <terra gnome org>
 
diff --git a/src/mstyle.c b/src/mstyle.c
index e0205907c..fb8386d58 100644
--- a/src/mstyle.c
+++ b/src/mstyle.c
@@ -1338,6 +1338,7 @@ gnm_style_merge (GnmStyle *base, GnmStyle const *overlay)
                if (elem_is_set (overlay, i)) {
                        elem_clear_contents (base, i);
                        elem_assign_contents (base, overlay, i);
+                       elem_set (base, i);
                        elem_changed (base, i);
                }
 }