quick implementation of previewing dialogxml for #564 (#565)

src/dialogxml/dialogs/dialog.cpp

@@ -1147,3 +1147,17 @@ void cDialogIterator::increment() {
 		parent = nullptr;
 	}
 }
+
+void preview_dialog_xml() {
+	fs::path dialog_xml = nav_get_rsrc({"xml"});
+	std::unique_ptr<DialogDefn> defn(load_dialog_defn(dialog_xml));
+	cDialog dialog(*defn);
+	// Make every control's click event close the dialog
+	for (auto control : dialog){
+		control.second->attachClickHandler([](cDialog& me, std::string item_hit, eKeyMod mod) -> bool {
+			me.toast(false);
+			return true;
+		});
+	}
+	dialog.run();
+}

src/dialogxml/dialogs/dialog.hpp

@@ -377,4 +377,7 @@ public:
 //	}
 //}
 
+// For development/debugging only.
+void preview_dialog_xml();
+
 #endif

src/game/boe.actions.cpp

@@ -2356,7 +2356,7 @@ void show_debug_help() {
 }
 
 // Non-comprehensive list of unused keys:
-// JUXYZ chijklnoqvy @#$-_+[]{},.'"`~/\|;:
+// UXYZ chijklnoqvy @#$-_+[]{},.'"`~/\|;:
 void init_debug_actions() {
 	add_debug_action({'B'}, "Leave town", debug_leave_town);
 	add_debug_action({'C'}, "Get cleaned up (lose negative status effects)", debug_clean_up);
@@ -2367,6 +2367,9 @@ void init_debug_actions() {
 	add_debug_action({'H'}, "Heal", debug_heal);
 	// This one was missing from the old help dialog:
 	add_debug_action({'I'}, "Give item", debug_give_item);
+	// TODO this is not recorded or replayed because the rsrc you pick might not even be packaged
+	// in the build
+	add_debug_action({'J'}, "Preview a dialog's layout", preview_dialog_xml);
 	add_debug_action({'K'}, "Kill everything", debug_kill);
 	add_debug_action({'N'}, "End scenario", []() -> void {handle_victory(true);});
 	add_debug_action({'O'}, "Print your location", debug_print_location);