[gtksourceview] solarized: use error underline for def:error

[Christian Hergert <chergert src gnome org>]

commit 5f629591a3cbbc15d20f1eae66d362dbc1eba033
Author: Christian Hergert <chergert redhat com>
Date:   Tue Sep 6 16:07:47 2022 -0700

    solarized: use error underline for def:error
    
    Using a bold red color for errors might have matched the original styles
    of Solarized when it was captive to a terminal, but it does not very much
    match modern IDEs and editors when it comes to what the pango renderer
    can do.
    
    Instead, use the expected error styling but color to match the Solarized
    palette.

 data/styles/solarized-dark.xml  | 2 +-
 data/styles/solarized-light.xml | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/data/styles/solarized-dark.xml b/data/styles/solarized-dark.xml
index 938a62b1..17d173e1 100644
--- a/data/styles/solarized-dark.xml
+++ b/data/styles/solarized-dark.xml
@@ -120,7 +120,7 @@
 
   <!-- Others -->
   <style name="def:preprocessor"            foreground="violet"/>
-  <style name="def:error"                   foreground="red" bold="true"/>
+  <style name="def:error"                   underline="error" underline-color="red"/>
   <style name="def:note"                    foreground="magenta" bold="true"/>
   <style name="def:net-address"             italic="true" underline="single"/>
 
diff --git a/data/styles/solarized-light.xml b/data/styles/solarized-light.xml
index 66e60ccf..98920f3a 100644
--- a/data/styles/solarized-light.xml
+++ b/data/styles/solarized-light.xml
@@ -121,7 +121,7 @@
 
   <!-- Others -->
   <style name="def:preprocessor"            foreground="violet"/>
-  <style name="def:error"                   foreground="red" bold="true"/>
+  <style name="def:error"                   underline="error" underline-color="red"/>
   <style name="def:note"                    foreground="magenta" bold="true"/>
   <style name="def:net-address"             italic="true" underline="single"/>