[shotwell] Escape file names in wallpaper.xml

[Jens Georg <jensgeorg src gnome org>]

commit 10f1cb78a3c9933cf8be56d6e71b2e4ae8086c73
Author: Jens Georg <mail jensge org>
Date:   Sat Jul 8 08:09:56 2017 +0200

    Escape file names in wallpaper.xml
    
    https://bugzilla.gnome.org/show_bug.cgi?id=784661

 src/DesktopIntegration.vala |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/DesktopIntegration.vala b/src/DesktopIntegration.vala
index 89ff556..80e8b2e 100644
--- a/src/DesktopIntegration.vala
+++ b/src/DesktopIntegration.vala
@@ -215,15 +215,15 @@ private class BackgroundSlideshowXMLBuilder {
     private void write_transition(File from, File to) throws Error {
         outs.put_string("  <transition>\n");
         outs.put_string("    <duration>%2.2f</duration>\n".printf(transition));
-        outs.put_string("    <from>%s</from>\n".printf(from.get_path()));
-        outs.put_string("    <to>%s</to>\n".printf(to.get_path()));
+        outs.put_string("    <from>%s</from>\n".printf(Markup.escape_text(from.get_path())));
+        outs.put_string("    <to>%s</to>\n".printf(Markup.escape_text(to.get_path())));
         outs.put_string("  </transition>\n");
     }
     
     private void write_static(File file) throws Error {
         outs.put_string("  <static>\n");
         outs.put_string("    <duration>%2.2f</duration>\n".printf(duration));
-        outs.put_string("    <file>%s</file>\n".printf(file.get_path()));
+        outs.put_string("    <file>%s</file>\n".printf(Markup.escape_text(file.get_path())));
         outs.put_string("  </static>\n");
     }