DiD: added lua for faster cutscene skipping

data/campaigns/Descent_Into_Darkness/_main.cfg

@@ -66,7 +66,11 @@
 [binary_path]
     path=data/campaigns/Descent_Into_Darkness
 [/binary_path]
-
+[lua]
+    code = <<
+        wesnoth.dofile('campaigns/Descent_Into_Darkness/lua/' .. 'skip_animations.lua')
+    >>
+[/lua]
 {campaigns/Descent_Into_Darkness/utils}
 {campaigns/Descent_Into_Darkness/scenarios}
 

data/campaigns/Descent_Into_Darkness/lua/skip_animations.lua

@@ -0,0 +1,25 @@
+---
+-- Extends several animation actions so that they do not trigger when the user
+-- is skipping messages.
+---
+
+local skippable_actions = {
+	"animate_unit",
+	"sound",
+	"delay"
+}
+
+local skip_actions = {}
+
+for i, action_id in ipairs(skippable_actions) do
+
+	skip_actions[action_id] = wesnoth.wml_actions[action_id]
+	wesnoth.wml_actions[action_id] = function(cfg)
+		if wesnoth.is_skipping_messages() then
+			return
+		end
+
+		skip_actions[action_id](cfg)
+	end
+end
+