Log Message:
Update meld to 3.15.2.

2016-03-28 meld 3.15.2
======================

  Features:

   * Port to use GtkSourceView's file loader and saver helpers, bringing
     several benefits (Kai Willadsen)
     * Loading and saving speed are significantly improved, and are
       asychronous
     * We try a wider range of locale-specific file encodings by default,
       and still support user-specified default encodings (requires
       GtkSourceView 3.18 or later)
     * We now support saving files with inconsistent newline types
     * Binary files will now be loaded on a best-effort basis
   * Reinstate support for Darcs; this is currently limited to very new
     (>2.10.3) versions (Guillaume Hoffmann)
   * Folder comparisons now apply text filters in the same way as file
     comparisons (David Rabel)
   * Add support for showing new shortcuts help dialog (Kai Willadsen, Piotr
     Drąg)
   * Preliminary support for building Meld as an xdg-app (Kai Willadsen)

  Fixes:

   * Many fixes for GTK+ 3.20 theming changes and widget compatibility issues
     (Kai Willadsen)
   * All accelerators should now consistently use the Primary key, for better
     integration on OSX systems (Youssef Adnan)
   * Significantly improve text filter performance (Jason Gauci)
   * Fix performance regression where scanning for missing files was extremely
     slow, especially in large repositories (Kai Willadsen)
   * Fix truncated line number display in short file (Kai Willadsen)
   * Fix filter dropdown not appearing below button (Kai Willadsen)
   * Add more documentation on setup and installation requirements (Jesse
     Sheridan, Martin Thoma)
   * Update the AppData to spec version 0.7+ (Richard Hughes)

  Translations:

   * Anders Jonsson (sv)
   * Benjamin Steinwender (de)
   * Bernd Homuth (de)
   * Cédric Valmary (oc)
   * Daniel Mustieles (es)
   * Gábor Kelemen (hu)
   * Jiri Grönroos (fi)
   * Luisa Cerón Perea (es)
   * Marek Černocký (cs)
   * Mario Blättermann (de)
   * Muhammet Kara (tr)
   * Pedro Albuquerque (pt)
   * Piotr Drąg (pl)
   * Rafael Fontenelle (pt_BR)
   * Мирослав Николић (sr, sr@latin)