Use GLib.markup_escape_text after all, just in case.

It's not much slower.

TODO

@@ -9,12 +9,13 @@ Gaupol 0.21.1
      different filesystems (Florian Léger, Osmo Salomaa)
  [X] Fix speed issues updating subtitle list selection (e.g. when doing
      a search-and-replace-all with a alot of matches)
- [X] Speed up miscellaneous GUI updates
+ [X] Speed up action sensitivity updates
 
 Gaupol 1.0
 ==========
 
  * Restore proper keeping track of recent files
+   - Should be possible with PyGObject > 3.7.3?
    - https://bugzilla.gnome.org/show_bug.cgi?id=678401
  * Add a built-in GStreamer-based video player
  * Add a GStreamer-based audio waveform display

gaupol/renderers/float.py

@@ -55,4 +55,4 @@ def _on_notify_text(self, *args):
         text = self._format.format(float(text))
         if has_comma:
             text = text.replace(".", ",")
-        self.props.markup = text
+        self.props.markup = GLib.markup_escape_text(text)