scen details cancel button

rsrc/dialogs/edit-scenario-details.xml

@@ -1,7 +1,7 @@
 <?xml version='1.0' encoding='UTF-8' standalone='no'?>
 <!-- NOTE: This file should be updated to use relative positioning the next time it changes. -->
 <?xml-stylesheet href="dialog.xsl" type="text/xsl"?>
-<dialog defbtn='okay'>
+<dialog defbtn='okay' escbtn='cancel'>
 	<pict type='dlog' num='16' top='8' left='8'/>
 	<text size='large' top='6' left='50' width='256' height='17'>Scenario Details</text>
 
@@ -47,4 +47,5 @@
 	</group>
 
 	<button name='okay' type='regular' top='354' left='395'>OK</button>
+	<button name='cancel' type='regular' relative='neg pos-in' rel-anchor='prev' top='0' left='71'>Cancel</button>
 </dialog>

src/scenedit/scen.core.cpp

@@ -2869,6 +2869,7 @@ static bool edit_scen_default_bgs(cDialog& me, std::string which, eKeyMod) {
 void edit_scen_details() {
 	cDialog info_dlg(*ResMgr::dialogs.get("edit-scenario-details"));
 	info_dlg["okay"].attachClickHandler(save_scen_details);
+	info_dlg["cancel"].attachClickHandler(std::bind(&cDialog::toast, &info_dlg, false));
 	
 	put_scen_details_in_dlog(info_dlg);