Town details suggest number of hostiles for thrash number

rsrc/dialogs/edit-town-details.xml

@@ -22,6 +22,9 @@
 		(When this many monsters are killed, the dungeon will be abandoned)
 	</text>
 	<field name='population' top='219' left='294' width='54' height='16'/>
+	<text name='population-hint' relative='pos neg' rel-anchor='prev' top='4' left='4' width='90'>
+		This town has {{num}} hostile creatures.
+	</text>
 
 	<text top='262' left='50' width='235' height='53'>
 		Town difficulty (0-10):

src/scenario/town.cpp

@@ -177,6 +177,15 @@ bool cTown::cWandering::isNull() const {
 	return true;
 }
 
+size_t cTown::count_hostiles() const {
+	size_t count = 0;
+	static std::set<eAttitude> hostile_attitudes = { eAttitude::HOSTILE_A, eAttitude::HOSTILE_B };
+	for(const cTownperson& creature : creatures){
+		count += hostile_attitudes.count(creature.start_attitude);
+	}
+	return count;
+}
+
 bool cTown::is_cleaned_out() const {
 	if(max_num_monst < 0) return false;
 	return m_killed >= max_num_monst;

src/scenario/town.hpp

@@ -84,6 +84,7 @@ public:
 	rectangle in_town_rect;
 	std::vector<cItem> preset_items;
 	std::vector<cTownperson> creatures;
+	size_t count_hostiles() const;
 	long max_num_monst;
 	std::vector<cField> preset_fields;
 	short spec_on_entry,spec_on_entry_if_dead;

src/scenedit/scen.townout.cpp

@@ -694,6 +694,7 @@ static void put_town_details_in_dlog(cDialog& me) {
 	me["chop"].setTextToNum(town->town_chop_time);
 	me["key"].setTextToNum(town->town_chop_key);
 	me["population"].setTextToNum(town->max_num_monst);
+	me["population-hint"].replaceText("{{num}}", std::to_string(town->count_hostiles()));
 	me["difficulty"].setTextToNum(town->difficulty);
 	cLedGroup& lighting = dynamic_cast<cLedGroup&>(me["lighting"]);
 	switch(town->lighting_type) {