make text-size an optional attribute of button

src/dialogxml/widgets/button.cpp

@@ -44,6 +44,8 @@ cButton::cButton(cDialog& parent,eControlType t) :
 }
 
 void cButton::defaultTextSize() {
+	if(textSize != 0) return;
+
 	if(type == BTN_TINY) textSize = 9;
 	else if(type == BTN_PUSH) textSize = 10;
 	else textSize = 12;
@@ -129,7 +131,7 @@ bool cButton::manageFormat(eFormat prop, bool set, boost::any* val) {
 
 bool cButton::parseAttribute(ticpp::Attribute& attr, std::string tagName, std::string fname) {
 	std::string name = attr.Name();
-	if(name == "type") {
+	if(name == "type"){
 		std::string val = attr.Value();
 		if(val == "small") setBtnType(BTN_SM);
 		else if(val == "regular") setBtnType(BTN_REG);
@@ -146,11 +148,16 @@ bool cButton::parseAttribute(ticpp::Attribute& attr, std::string tagName, std::s
 		else if(val == "push") setBtnType(BTN_PUSH);
 		else throw xBadVal(tagName, name, val, attr.Row(), attr.Column(), fname);
 		return true;
-	} else if(name == "def-key") {
+	}else if(name == "text-size"){
 		std::string val = attr.Value();
-		try {
+		short size = std::stoi(val);
+		textSize = size;
+		return true;
+	}else if(name == "def-key"){
+		std::string val = attr.Value();
+		try{
 			attachKey(parseKey(val));
-		} catch(int) {
+		}catch(int){
 			throw xBadVal(tagName, name, val, attr.Row(), attr.Column(), fname);
 		}
 		return true;

src/dialogxml/widgets/button.hpp

@@ -80,7 +80,7 @@ private:
 	static rectangle btnRects[13][2];
 protected:
 	/// Size of the button's descriptive text
-	short textSize;
+	short textSize = 0;
 	/// Determines whether the button's label should be word wrapped.
 	bool wrapLabel;
 	/// The button's text colour; only used by LED and tiny buttons

src/game/boe.dlgutil.cpp

@@ -1256,9 +1256,7 @@ void pick_preferences(bool record) {
 	
 	cDialog prefsDlog(*ResMgr::dialogs.get("preferences"));
 	prefsDlog.attachClickHandlers(&prefs_event_filter, {"okay", "cancel"});
-	
 	prefsDlog.attachClickHandlers(&reset_help, {"resethelp"});
-	dynamic_cast<cButton&>(prefsDlog["resethelp"]).setTextSize(10);
 
 	cLedGroup& displayMode = dynamic_cast<cLedGroup&>(prefsDlog["display"]);
 	switch(get_int_pref("DisplayMode")) {