2020-04-19 meld 3.21.0

UI changes:

• Move to a modern GTK headerbar-based design, including:
  
  • More extensive action support in the header bar
    
  • New comparison overview map widget that provides a clearer overview for
    multiple panes at once, and allows for more natural scrollbar
    positioning (Kai Willadsen)
    
  • Text, filename and version filters are now all accessible from the
    toolbar (Kai Willadsen)
    
  • Refreshed find bar that more closely matches other applications (Kai
    Willadsen)
    
  • Remove application menu in line with Initiatives#4 (Kai Willadsen)
    
  • New recent comparison selection widget (Kai Willadsen)
    
  • Change tab style to be full-width and hidden for single tab windows (Kai
    Willadsen)
    
• Make file comparison change navigation more intuitive by changing how it
  decides where to scroll from (Heikki Ketoharju)
  
• Completely refreshed Meld application icon (Alex Monday)
  
• File comparison now has overscroll at the bottom of file comparisons,
  making it easier to see end-of-file differences and improving scroll
  syncing (Kai Willadsen)
  
• Text wrapping, whitespace, line numbers and line highlight can now all be
  toggled from the file comparison status bar (Kai Willadsen)
  

Features:

• Add support for CVS in version control comparisons (gitqlt)
  
• Copy selected file paths in folder comparison (WenGuoyao)
  
• Improve dark theme detection so custom Meld highlighting better matches
  the user's theme (Kai Willadsen)
  
• Meld's built-in GtkSourceView schemes now support syntax highlighting
  (Kai Willadsen)
  
• Moving past the first or last change using our change navigation now
  alerts with the standard error bell (Kai Willadsen)
  
• Support nightly Flatpak builds of Meld using GNOME's CI (Kai Willadsen)
  
• Support development using GNOME Builder's workflow
  

Fixes:

• CI and build system fixes (Michael Behrisch, Frank Dana, Piotr Drąg, Vasily Galkin)
  
• Fix running uninstalled from non-project-base folder (Vasily Galkin)
  
• Fix file comparison closing after file save (Vasily Galkin)
  
• Fix file comparison handling of certain line breaks (Kai Willadsen)
  
• Fix folder comparison display of large file sizes (andre)
  
• Fix folder comparisons with pre-epoch timestamps (Kai Willadsen)
  
• Fix folder comparisons not handling ignore blank lines + text filters (Kai
  Willadsen)
  
• Handle file deletion better on NFS mounts (Kai Willadsen)
  
• Fix handling of bad filter regular expressions (Kai Willadsen)
  
• Fix push action on missing changes in three way comparison (Kai Willadsen)
  
• Default file chooser encoding to autodetect (Kai Willadsen)
  
• Minor UI fixes:
  
  • Statusbar now correctly sets default encoding & file type for empty
    files (Kai Willadsen)
    
  • Statusbar tries to keep a constant width for the cursor label (Kai
    Willadsen)
    
  • Folder comparisons set sensitivity correctly for empty rows (Kai
    Willadsen)
    
  • Give commit dialog message area a reasonable height (Kai Willadsen)
    
  • Fix long file name wrapping in info bar notifications (Kai Willadsen)
    
  • Fix long file name ellipsization in file comparisons (Kai Willadsen)
    
• Windows fixes:
  
  • Fix crash when started with unexpected environment (Vasily Galkin)
    
  • Fix dbus support for single-instance behaviour (Vasily Galkin)
    
  • Fix internationalisation building from source (ThunderEX)
    
  • Fix SVG icon display (Kai Willadsen)
    
  • Support logging to a file on Windows for debugging (Kai Willadsen)
    
  • Default file encoding to UTF-8 to avoid Windows-specific locale issues
    (Kai Willadsen)
    
• Typo fixes (luzpaz)
  
• Localisation fixes (Piotr Drąg)
  

Internal changes:

• Add Meson build system support; setuptools is still supported for Windows
  and Mac OS builds, but Linux distributions should switch to building with
  Meson (Bilal Elmoussaoui, Kai Willadsen)
  

• Move from GtkUIManager to GAction-based actions
  

• Move all UI-file-constructed widgets from custom Python wrapper classes
  to using real GtkWidget templates
  

• Move UI templates, menus, custom icons and CSS to be resource-loaded
  

• Move to pre-commit using flake8 and isort for CI linting
  

• Move to new GtkSourceView 4 API
  

• Modernised Python GObject API usage, including signal and property usage
  

• Fix some deprecated GTK API usage
  

• Support Python 3.8
  

• Updated dependencies:

  • Python 3.6
    
  • GTK+ 3.20
    
  • GLib 2.48
    
  • GtkSourceView 4.0
    
  • pygobject 3.30
    
  • pycairo 1.15
    

• Issues fixed: 62, 78, 119, 170, 240, 265, 265, 267, 279, 290, 313, 314,
  316, 321, 322, 337, 341, 342, 344, 344, 350, 351, 359, 419, 432, 439, 442,
  451

Translations:

• Alan Mortensen (da)
  
• Anders Jonsson (sv)
  
• Asier Sarasua Garmendia (eu)
  
• Ask Hjorth Larsen (da)
  
• Balázs Meskó (hu)
  
• Balázs Úr (hu)
  
• Daniel Mustieles (es)
  
• Daniel Șerbănescu (ro)
  
• Emin Tufan Çetin (tr)
  
• Fran Dieguez (gl)
  
• Guillaume Bernard (fr)
  
• Jiri Grönroos (fi)
  
• Kukuh Syafaat (id)
  
• Marek Černocký (cs)
  
• Matej Urbančič (sl)
  
• Milo Casagrande (it)
  
• Piotr Drąg (pl)
  
• Rafael Fontenelle (pt_BR)
  
• Ryuta Fujii (ja)
  
• Sabri Ünal (tr)
  
• sicklylife (ja)
  
• Wolfgang Stöggl (de)
  
• Yuri Chornoivan (uk)