[gtksourceview] map: be more careful with edge boundary

[Christian Hergert <chergert src gnome org>]

commit eefeb5943531d2043efc2d19cf240541298e720d
Author: Christian Hergert <chergert redhat com>
Date:   Fri Jun 18 20:53:36 2021 -0700

    map: be more careful with edge boundary

 gtksourceview/gtksourcemap.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
---
diff --git a/gtksourceview/gtksourcemap.c b/gtksourceview/gtksourcemap.c
index 9d71b1a5..af18fbdf 100644
--- a/gtksourceview/gtksourcemap.c
+++ b/gtksourceview/gtksourcemap.c
@@ -300,7 +300,11 @@ update_scrubber_position (GtkSourceMap *map)
                                (gdouble)view_height *
                                (gdouble)child_height) +
                               iter_area.height;
-       scrubber_area.height = CLAMP (scrubber_area.height, 1, alloc.height);
+
+       if (scrubber_area.height > alloc.height)
+               scrubber_area.height = alloc.height;
+       else if (scrubber_area.height < 0)
+               scrubber_area.height = 1;
 
        if (memcmp (&scrubber_area, &priv->scrubber_area, sizeof scrubber_area) != 0)
        {