3.15.3 (unstable); Gtk: * CssProvider: Add CssProviderError and signal_parsing_error() (Kjell Ahlstedt) * Add CssSection. (Kjell Ahlstedt) * Dialog: Fix the constructors with DialogFlags. (Kjell Ahlstedt) Bug #738513 (Simonas Kazlauskas) * ScaleButton: - Correct the constructor. - Add a constructor without the icons. (Murray Cumming) * ScrolledWindow: Add get/set_overlay_scrolling() and property. (Juan R. García Blanco) * Stack: Add hhomogeneous and vhomogeneous properties. (Juan R. García Blanco) * TextTag: Add fallback, fallback-set, letter-spacing, and letter-spacing-set properties. (Juan R. García Blanco) * TextView: Add monospace property. (Juan R. García Blanco) * Widget: Added get_action_group() and list_action_prefixes(). (Murray Cumming) Documentation: * Add an empty line after @newin where it's missing. (Kjell Ahlstedt) * Fix some Doxygen warnings. (Kjell Ahlstedt) * ScaleButton: Document the constructors. (Murray Cumming)