Merge branch 'master' into jgrpp

# Conflicts:
#	src/airport_gui.cpp
#	src/blitter/32bpp_optimized.cpp
#	src/blitter/32bpp_simple.cpp
#	src/blitter/32bpp_sse2.cpp
#	src/blitter/8bpp_optimized.cpp
#	src/blitter/8bpp_simple.cpp
#	src/blitter/null.cpp
#	src/build_vehicle_gui.cpp
#	src/company_gui.cpp
#	src/crashlog.cpp
#	src/dropdown.cpp
#	src/dropdown_type.h
#	src/genworld_gui.cpp
#	src/gfx.cpp
#	src/main_gui.cpp
#	src/newgrf_debug_gui.cpp
#	src/news_gui.cpp
#	src/news_type.h
#	src/openttd.cpp
#	src/order_gui.cpp
#	src/settings.cpp
#	src/settings_gui.cpp
#	src/signs.cpp
#	src/smallmap_gui.cpp
#	src/spritecache.cpp
#	src/spriteloader/grf.cpp
#	src/texteff.cpp
#	src/toolbar_gui.cpp
#	src/town_cmd.cpp
#	src/vehicle.cpp
#	src/vehicle_gui.cpp
#	src/video/opengl.cpp
#	src/viewport.cpp
#	src/waypoint_cmd.cpp
#	src/zoom_type.h

src/dropdown_func.h

@@ -21,4 +21,12 @@ int HideDropDownMenu(Window *pw);
 
 void GetParentWindowInfo(Window *w, WindowClass &parent_wc, WindowNumber &parent_wn);
 
+/* Helper functions for commonly used drop down list items. */
+std::unique_ptr<DropDownListItem> MakeDropDownListDividerItem();
+std::unique_ptr<DropDownListItem> MakeDropDownListStringItem(StringID str, int value, bool masked = false, bool shaded = false);
+std::unique_ptr<DropDownListItem> MakeDropDownListStringItem(const std::string &str, int value, bool masked = false, bool shaded = false);
+std::unique_ptr<DropDownListItem> MakeDropDownListIconItem(SpriteID sprite, PaletteID palette, StringID str, int value, bool masked = false, bool shaded = false);
+std::unique_ptr<DropDownListItem> MakeDropDownListIconItem(const Dimension &dim, SpriteID sprite, PaletteID palette, StringID str, int value, bool masked = false, bool shaded = false);
+std::unique_ptr<DropDownListItem> MakeDropDownListCheckedItem(bool checked, StringID str, int value, bool masked = false, bool shaded = false);
+
 #endif /* DROPDOWN_FUNC_H */