Add more unit tests for nested event handlers and a few other things

data/test/scenarios/event_handlers_in_events.cfg

@@ -233,3 +233,92 @@
         {RETURN ({VARIABLE_CONDITIONAL pass_test equals 1})}
     [/event]
 )}
+
+{GENERIC_UNIT_TEST "event_handers_in_events__delayed" (
+    [event]
+        name=prestart
+        {VARIABLE pass_test 0}
+
+        [event]
+            name=start
+            delayed_variable_substitution=yes
+            {VARIABLE pass_test "$($pass_test + 1)"}
+        [/event]
+        
+        {VARIABLE pass_test 1}
+    [/event]
+    [event]
+        name=turn 1
+        {RETURN ({VARIABLE_CONDITIONAL pass_test equals 2})}
+    [/event]
+)}
+
+{GENERIC_UNIT_TEST "event_handlers_in_events__dynamic_filter" (
+    [event]
+        name=start
+        {VARIABLE pass_test 0}
+        [set_variables]
+            name=filter
+            [value]
+                race=elf
+            [/value]
+        [/set_variables]
+        {UNIT 1 "Orcish Grunt" 1 1 ()}
+        {UNIT 1 "Elvish Archer" 2 2 ()}
+        [event]
+            name=post_advance
+            [insert_tag]
+                name=filter
+                variable=filter
+            [/insert_tag]
+            {VARIABLE_OP pass_test add 1}
+        [/event]
+        [modify_unit]
+            [filter]
+                x=1,2
+                y=1,2
+            [/filter]
+            experience=50
+        [/modify_unit]
+        {RETURN ({VARIABLE_CONDITIONAL pass_test equals 1})}
+    [/event]
+)}
+
+{GENERIC_UNIT_TEST "event_remove_test" (
+    [event]
+        name=start
+        [remove_event]
+            id=fail
+        [/remove_event]
+    [/event]
+    [event]
+        id=fail
+        name=start
+        {FAIL}
+    [/event]
+    [event]
+        name=start
+        {SUCCEED}
+    [/event]
+)}
+
+{GENERIC_UNIT_TEST "event_repeat_test" (
+    [event]
+        name=start
+        {VARIABLE trigger_count 0}
+    [/event]
+    [event]
+        name=turn_end
+        first_time_only=no
+        {VARIABLE_OP trigger_count add 1}
+    [/event]
+    [event]
+        name=side turn
+        first_time_only=no
+        [end_turn][/end_turn]
+    [/event]
+    [event]
+        name=turn 3
+        {RETURN ({VARIABLE_CONDITIONAL trigger_count equals 2})}
+    [/event]
+)}

wml_test_schedule

@@ -87,6 +87,10 @@
 0 event_handlers_in_events_6
 0 event_handlers_in_events_7
 0 event_handlers_in_events_8
+0 event_handers_in_events__delayed
+0 event_handlers_in_events__dynamic_filter
+0 event_remove_test
+0 event_repeat_test
 0 filter_vision
 0 scatter_units
 0 has_ally