LoW: fix missing persistent data at the end of Chapter 3

data/campaigns/Legend_of_Wesmere/lua/wml_tags.lua

@@ -8,6 +8,8 @@ local wml_actions = wesnoth.wml_actions
 local T = wml.tag
 local vars = wml.variables
 
+helper = wesnoth.require "lua/helper.lua"
+
 function wesnoth.wml_actions.shift_labels(cfg)
 	for k, v in ipairs(labels) do
 		wml_label { x = v.x, y = v.y }
@@ -57,6 +59,32 @@ function wesnoth.wml_actions.replace_map(cfg)
 	replace_map { map = new_map, expand = true, shrink = true }
 end
 
+function wesnoth.wml_actions.unstore_left_behind_units(cfg)
+	if wesnoth.get_variable("l3_store_kalenz") ~= nil then
+		l3_store_kalenz = helper.get_variable_array("l3_store_kalenz")
+		for i,_ in ipairs(l3_store_kalenz) do
+			var_name = "l3_store_kalenz[" .. tostring(i-1) .. "]"
+			wml_actions.unstore_unit {
+				variable = var_name,
+				x = "recall",
+				y = "recall"
+			}
+		end
+		wesnoth.set_variable("l3_store_kalenz",nil)
+	end
+	if wesnoth.get_variable("l3_store_landar") ~= nil then
+		l3_store_landar = helper.get_variable_array("l3_store_landar")
+		for i,_ in ipairs(l3_store_landar) do
+			var_name = "l3_store_landar[" .. tostring(i-1) .. "]"
+			wml_actions.unstore_unit {
+				variable = var_name,
+				x = "recall",
+				y = "recall"
+			}
+		end
+		wesnoth.set_variable("l3_store_landar",nil)
+	end
+end
 
 function wesnoth.wml_actions.persistent_carryover_store(cfg)
 	for num, side in ipairs(wesnoth.sides) do

data/campaigns/Legend_of_Wesmere/scenarios/chapter3/12_Revelations.cfg

@@ -291,6 +291,7 @@
 
     [event]
         name=victory
+        [unstore_left_behind_units][/unstore_left_behind_units]
         [persistent_carryover_store]
             scenario_id = LoW_Chapter_Three
         [/persistent_carryover_store]

data/campaigns/Legend_of_Wesmere/scenarios/chapter4/13_News_from_the_Front.cfg

@@ -102,6 +102,36 @@
     [/side]
 #endif
 
+#define LEAVE_BEHIND_L3 NAME SIDE
+    # these have been left behind to guard the Ka'lian
+    [store_unit]
+        variable=l3_store_{NAME}
+        kill=yes
+        [filter]
+            side={SIDE}
+            type=Elvish Marshal,Elvish Champion,Elvish Avenger,Elvish Sharpshooter
+            [not]
+                id=Kalenz
+            [/not]
+            [not]
+                id=Anduilas
+            [/not]
+            [not]
+                id=Arkildur
+            [/not]
+            [not]
+                id=Landar
+            [/not]
+            [not]
+                id=Cleodil
+            [/not]
+            [not]
+                {FILTER_LOYALS}
+            [/not]
+        [/filter]
+    [/store_unit]
+#enddef
+
     [event]
         name=start
 
@@ -109,6 +139,8 @@
         [persistent_carryover_unstore]
             scenario_id = LoW_Chapter_Three
         [/persistent_carryover_unstore]
+        {LEAVE_BEHIND_L3 kalenz 1}
+        {LEAVE_BEHIND_L3 landar 2}
 #endif
 
         #TODO recall or create if not recallable