[fractal] markdown: Enable highlighting during the initial load

[Christopher Davis <christopherdavis src gnome org>]

commit 2158b64a4b17aefe7834b78bbc033c129a0e9ae0
Author: Christopher Davis <brainblasted disroot org>
Date:   Thu Jul 11 02:50:26 2019 -0700

    markdown: Enable highlighting during the initial load
    
    Previously we did not enable syntax highlighting if the user
    already had markdown enabled during startup. This commit
    ensures that we enable it.
    
    Closes https://gitlab.gnome.org/GNOME/fractal/issues/302

 fractal-gtk/src/app/connect/markdown.rs | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/fractal-gtk/src/app/connect/markdown.rs b/fractal-gtk/src/app/connect/markdown.rs
index 5314eb25..a6a49246 100644
--- a/fractal-gtk/src/app/connect/markdown.rs
+++ b/fractal-gtk/src/app/connect/markdown.rs
@@ -43,6 +43,12 @@ impl App {
             markdown_switch.set_active(true);
             md_img.set_from_icon_name("format-indent-more-symbolic", gtk::IconSize::Menu);
             txt.get_style_context().remove_class("dim-label");
+
+            if let Some(md_lang) = md_lang.clone() {
+                buffer.set_highlight_matching_brackets(true);
+                buffer.set_language(&md_lang);
+                buffer.set_highlight_syntax(true);
+            }
         }
 
         let op = op.clone();