fix compiler warnings

Author: cnjinhao

include/nana/gui/widgets/treebox.hpp

@@ -110,21 +110,18 @@ namespace nana
 			public:
 				struct treebox_node_type
 				{
-					treebox_node_type();
-					treebox_node_type(std::string);
+					treebox_node_type(std::string = {});
 					treebox_node_type& operator=(const treebox_node_type&);
 
 					::std::string text;
 					std::any value;
-					bool expanded;
-					bool hidden;
-					bool selected;
-					checkstate checked;
+					bool expanded{ false };
+					bool hidden{ false };
+					bool selected{ false };
+					checkstate checked{ checkstate::unchecked };
 					::std::string img_idstr;
 				};
 
-				struct pseudo_node_type{};
-
 				using tree_cont_type = widgets::detail::tree_cont<treebox_node_type>;
 				using node_type = tree_cont_type::node_type;
 

source/gui/programming_interface.cpp

@@ -1750,6 +1750,7 @@ namespace api
 		return restrict::bedrock.vkeyboard().numeric(wd, padding);
 #else
 		(void)wd;
+		(void)padding;
 		return false;
 #endif	
 	}

source/gui/widgets/menu.cpp

@@ -735,7 +735,6 @@ namespace nana
 			{
 				nana::size size = _m_client_size();
 
-				unsigned int two = platform_abstraction::dpi_scale(widget_->handle(), 2u);
 				size.width += platform_abstraction::dpi_scale(widget_->handle(), detail_.border.x) * 2u;
 				size.height += platform_abstraction::dpi_scale(widget_->handle(), detail_.border.y) * 2u;
 

source/gui/widgets/treebox.cpp

@@ -845,6 +845,8 @@ namespace nana
 
 			bool set_selected_multi(node_type* node, bool crtl, bool shift)
 			{
+				(void)shift;
+
 				if (crtl)
 				{
 					data.stop_drawing = true;
@@ -956,7 +958,7 @@ namespace nana
 				if(node_state.selected != node)
 				{
 					data.stop_drawing = true;
-					if (node_state.selected && single_selection || node == nullptr)
+					if ((node_state.selected && single_selection) || !node)
 					{
 						auto nodes_copy = node_state.nodes_selected;
 						node_state.clear();
@@ -1911,12 +1913,9 @@ namespace nana
 
 		//class trigger
 		//struct treebox_node_type
-		trigger::treebox_node_type::treebox_node_type()
-			:expanded(false), hidden(false), checked(checkstate::unchecked), selected(false)
-		{}
 
 		trigger::treebox_node_type::treebox_node_type(std::string text)
-			:text(std::move(text)), expanded(false), hidden(false), checked(checkstate::unchecked), selected(false)
+			:text(std::move(text))
 		{}
 
 		trigger::treebox_node_type& trigger::treebox_node_type::operator=(const treebox_node_type& rhs)