make text-size an optional attribute of button

rsrc/dialogs/preferences.xml

@@ -47,7 +47,7 @@
 	<led name='lesswm' relative='pos-in pos' rel-anchor='prev' top='10' left='0'>Fewer wandering monsters</led>
 	<led name='skipsplash' relative='pos-in pos' rel-anchor='prev' top='10' left='0'>Skip splash screen on startup</led>
 	<led name='nohelp' relative='pos-in pos' rel-anchor='prev' top='10' left='0'>Never show instant help</led>
-	<button name='resethelp' type='tiny' relative='pos-in pos' rel-anchor='prev' top='10' left='0'>
+	<button name='resethelp' type='tiny' text-size='10' relative='pos-in pos' rel-anchor='prev' top='10' left='0'>
 		Reset instant help (all help windows will reappear)
 	</button>
 	<button name='okay' relative='abs pos' rel-anchor='prev' type='regular' top='17' left='354'>OK</button>

rsrc/schemas/dialog.xsd

@@ -207,6 +207,7 @@
 		</xs:sequence>
 		<xs:attribute name="name" use="required" type="xs:token"/>
 		<xs:attribute name="type" use="required" type="btntype"/>
+		<xs:attribute name="text-size" type="xs:integer"/>
 		<xs:attribute name="wrap" default="false" type="bool"/>
 		<xs:attribute ref="def-key"/>
 		<xs:attribute name="fromlist" default="none" type="xs:string"/>

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;
@@ -146,6 +148,11 @@ 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 == "text-size"){
+		std::string val = attr.Value();
+		short size = std::stoi(val);
+		textSize = size;
+		return true;
 	}else if(name == "def-key"){
 		std::string val = attr.Value();
 		try{

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")) {