fix a selection text issue of text_editor with pressing shift

include/nana/gui/basis.hpp

@@ -77,8 +77,8 @@ namespace nana
 			start_of_headline = 0x1,	//Ctrl+A
 			end_of_text = 0x3,	//Ctrl+C
 			backspace = 0x8, tab = 0x9,
-			enter_n = 0xA, enter = 0xD, enter_r = 0xD,
 			alt = 0x12,
+			enter_n = 0xA, enter = 0xD, enter_r = 0xD,
 			sync_idel = 0x16,	//Ctrl+V
 			cancel = 0x18,	//Ctrl+X
 			end_of_medium = 0x19,	//Ctrl+Y
@@ -95,6 +95,8 @@ namespace nana
 			undo = substitute,
 
 			//System Code for OS
+			os_shift = 0x10,
+			os_ctrl = 0x11,
 			os_pageup = 0x21, os_pagedown,
 			os_arrow_left = 0x25, os_arrow_up, os_arrow_right, os_arrow_down,
 			os_insert = 0x2D, os_del ,