bindings: add bindings for shift-up/down (select and scroll)

NEWS

@@ -32,6 +32,7 @@ ncmpcpp-0.7 (????-??-??)
 * Output of the visualizer now scales automatically as long as 'visualizer_sample_multiplier' is set to 1.
 * Command line switch that prints current song to the standard output is available once again.
 * Defined action chains are now shown in help screen.
+* Action chains for selecting an item and scrolling up/down are now bound to Shift-Up and Shift-Down respectively.
 
 ncmpcpp-0.6.7 (2015-09-12)
 * Fetching artist info from last.fm was fixed.

doc/bindings

@@ -154,9 +154,17 @@
 #def_key "up"
 #  scroll_up
 #
+#def_key "shift-up"
+#  select_item
+#  scroll_up
+#
 #def_key "down"
 #  scroll_down
 #
+#def_key "shift-down"
+#  select_item
+#  scroll_down
+#
 #def_key "["
 #  scroll_up_album
 #

src/bindings.cpp

@@ -471,8 +471,12 @@ void BindingsConfiguration::generateDefaults()
 		bind(k, Actions::Type::MouseEvent);
 	if (notBound(k = stringToKey("up")))
 		bind(k, Actions::Type::ScrollUp);
+	if (notBound(k = stringToKey("shift-up")))
+		bind(k, Binding::ActionChain({ &Actions::get(Actions::Type::SelectItem), &Actions::get(Actions::Type::ScrollUp) }));
 	if (notBound(k = stringToKey("down")))
 		bind(k, Actions::Type::ScrollDown);
+	if (notBound(k = stringToKey("shift-down")))
+		bind(k, Binding::ActionChain({ &Actions::get(Actions::Type::SelectItem), &Actions::get(Actions::Type::ScrollDown) }));
 	if (notBound(k = stringToKey("[")))
 		bind(k, Actions::Type::ScrollUpAlbum);
 	if (notBound(k = stringToKey("]")))