[pitivi] title: Escape text so it can be properly rendered by pango

[Thibault Saunier <tsaunier src gnome org>]

commit 366f3fe196c430f1dff0920215f12c5614a7aa6d
Author: Thibault Saunier <tsaunier igalia com>
Date:   Thu Mar 12 15:28:06 2020 -0300

    title: Escape text so it can be properly rendered by pango

 pitivi/timeline/previewers.py | 12 ++++++------
 pitivi/titleeditor.py         | 17 ++++++++++-------
 2 files changed, 16 insertions(+), 13 deletions(-)
---
diff --git a/pitivi/timeline/previewers.py b/pitivi/timeline/previewers.py
index 6641f56e..fcf71c9d 100644
--- a/pitivi/timeline/previewers.py
+++ b/pitivi/timeline/previewers.py
@@ -1355,14 +1355,14 @@ class TitlePreviewer(Gtk.Layout, Previewer, Zoomable, Loggable):
         context.set_source_rgb(1, 1, 1)
 
         # Get text
-        res, text = self.ges_elem.get_child_property("text")
+        res, escaped_text = self.ges_elem.get_child_property("text")
         if res:
-            text = text.strip().split("\n", 1)[0]
-        if not res or not text:
-            text = _("Title Clip")
+            escaped_text = escaped_text.strip().split("\n", 1)[0]
+        if not res or not escaped_text:
+            escaped_text = _("Title Clip")
 
         # Adapt to RTL/LTR direction
-        direction = Pango.unichar_direction(text[0])
+        direction = Pango.unichar_direction(escaped_text[0])
         if direction in (Pango.Direction.LTR, Pango.Direction.NEUTRAL):
             stops = (0, 1)
             x_pos = 10
@@ -1393,7 +1393,7 @@ class TitlePreviewer(Gtk.Layout, Previewer, Zoomable, Loggable):
         layout.set_ellipsize(Pango.EllipsizeMode.END)
 
         # Draw text
-        layout.set_text(text, -1)
+        layout.set_markup(escaped_text, -1)
         context.move_to(x_pos, (rect.height / 2) - 11)
         PangoCairo.show_layout(context, layout)
 
diff --git a/pitivi/titleeditor.py b/pitivi/titleeditor.py
index bec31201..92c6a753 100644
--- a/pitivi/titleeditor.py
+++ b/pitivi/titleeditor.py
@@ -15,9 +15,11 @@
 # You should have received a copy of the GNU Lesser General Public
 # License along with this program; if not, see <http://www.gnu.org/licenses/>.
 import os
+import html
 from gettext import gettext as _
 
 from gi.repository import GES
+from gi.repository import GLib
 from gi.repository import Gst
 from gi.repository import Gtk
 from gi.repository import Pango
@@ -163,7 +165,7 @@ class TitleEditor(Loggable):
         self._set_child_property("font-desc", font_desc)
 
     def _update_from_source(self, source):
-        self.textbuffer.set_text(source.get_child_property("text")[1] or "")
+        self.textbuffer.props.text = html.unescape(source.get_child_property("text")[1] or "")
         self.settings['x-absolute'].set_value(source.get_child_property("x-absolute")[1])
         self.settings['y-absolute'].set_value(source.get_child_property("y-absolute")[1])
         self.settings['valignment'].set_active_id(
@@ -187,9 +189,9 @@ class TitleEditor(Loggable):
             # Nothing to update.
             return
 
-        text = self.textbuffer.props.text
-        self.log("Source text updated to %s", text)
-        self._set_child_property("text", text)
+        escaped_text = html.escape(self.textbuffer.props.text)
+        self.log("Source text updated to %s", escaped_text)
+        self._set_child_property("text", escaped_text)
 
     def _update_source_cb(self, updated_obj):
         """Handles changes in the advanced property widgets at the bottom."""
@@ -272,11 +274,12 @@ class TitleEditor(Loggable):
             return
 
         if pspec.name == "text":
-            res, value = self.source.get_child_property(pspec.name)
+            res, escaped_text = self.source.get_child_property(pspec.name)
             assert res, pspec.name
-            if self.textbuffer.props.text == value or "":
+            text = html.unescape(escaped_text)
+            if self.textbuffer.props.text == text or "":
                 return
-            self.textbuffer.props.text = value
+            self.textbuffer.props.text = text
         elif pspec.name in ["x-absolute", "y-absolute"]:
             res, value = self.source.get_child_property(pspec.name)
             assert res, pspec.name