[accerciser] IPython console: also use a font which shows U+FFFC

[Samuel Thibault <sthibaul src gnome org>]

commit 67bddf4f8b1549ea6daa982e1f6acedbd8bf965d
Author: Samuel Thibault <samuel thibault ens-lyon org>
Date:   Thu Jun 20 16:53:31 2019 +0200

    IPython console: also use a font which shows U+FFFC
    
    And preferrably mono
    
    Fixes #8

 plugins/ipython_view.py | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)
---
diff --git a/plugins/ipython_view.py b/plugins/ipython_view.py
index f718877..b4a787f 100755
--- a/plugins/ipython_view.py
+++ b/plugins/ipython_view.py
@@ -380,7 +380,20 @@ class ConsoleView(gtk.TextView):
     Initialize console view.
     '''
     gtk.TextView.__init__(self)
-    self.modify_font(Pango.FontDescription('Mono'))
+    pango_ctx = self.get_pango_context()
+    chosen = None
+    for f in pango_ctx.list_families():
+        name = f.get_name()
+        # These are known to show e.g U+FFFC
+        if name in [ "Courier New", "Courier Mono" ]:
+            chosen = name
+            break
+        if name in [ "Liberation Sans" ]:
+            chosen = name
+            # But prefer a monospace one if possible
+    if chosen == None:
+        chosen = "Mono"
+    self.modify_font(Pango.FontDescription(chosen))
     self.set_cursor_visible(True)
     self.text_buffer = self.get_buffer()
     self.mark = self.text_buffer.create_mark('scroll_mark',