[vte] widget: Improve font sanitisation

[Christian Persch <chpe src gnome org>]

commit ec2b76ab7c25ea9257048e6fd2d130e77b7a56cc
Author: Christian Persch <chpe src gnome org>
Date:   Sun Jan 24 20:43:51 2021 +0100

    widget: Improve font sanitisation
    
    Clamp the font weight instead of simply unsetting any weight specified.
    
    https://gitlab.gnome.org/GNOME/vte/-/issues/323

 src/vte.cc | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/vte.cc b/src/vte.cc
index 04039257..7fc177d9 100644
--- a/src/vte.cc
+++ b/src/vte.cc
@@ -7354,8 +7354,9 @@ Terminal::update_font_desc()
         if ((pango_font_description_get_set_fields(desc.get()) & PANGO_FONT_MASK_WEIGHT) &&
             (pango_font_description_get_weight(desc.get()) > PANGO_WEIGHT_MEDIUM) &&
             !m_bold_is_bright) {
-                pango_font_description_unset_fields(desc.get(),
-                                                    PangoFontMask(PANGO_FONT_MASK_WEIGHT));
+                pango_font_description_set_weight(desc.get(),
+                                                  std::min(pango_font_description_get_weight(desc.get()),
+                                                           PANGO_WEIGHT_MEDIUM));
         }
 
         bool const same_desc = m_unscaled_font_desc &&