Fix check sign in Encoding menu not shown issue

Fix #3737, close #3738

PowerEditor/src/Notepad_plus.cpp

@@ -3911,7 +3911,8 @@ void Notepad_plus::checkUnicodeMenuItems() const
 	if (encoding == -1)
 	{
 		// Uncheck all in the sub encoding menu
-		::CheckMenuRadioItem(_mainMenuHandle, IDM_FORMAT_ENCODE, IDM_FORMAT_ENCODE_END, IDM_FORMAT_ENCODE, MF_BYCOMMAND);
+        HMENU _formatMenuHandle = ::GetSubMenu(_mainMenuHandle, MENUINDEX_FORMAT);
+        doCheck(_formatMenuHandle, IDM_FORMAT_ENCODE);
 		::CheckMenuItem(_mainMenuHandle, IDM_FORMAT_ENCODE, MF_UNCHECKED | MF_BYCOMMAND);
 
 		if (id == -1) //um == uni16BE_NoBOM || um == uni16LE_NoBOM
@@ -3941,7 +3942,8 @@ void Notepad_plus::checkUnicodeMenuItems() const
 		::CheckMenuItem(_mainMenuHandle, IDM_FORMAT_ANSI, MF_UNCHECKED | MF_BYCOMMAND);
 
 		// Check the encoding item
-		::CheckMenuRadioItem(_mainMenuHandle, IDM_FORMAT_ENCODE, IDM_FORMAT_ENCODE_END, cmdID, MF_BYCOMMAND);
+        HMENU _formatMenuHandle = ::GetSubMenu(_mainMenuHandle, MENUINDEX_FORMAT);
+        doCheck(_formatMenuHandle, cmdID);
 	}
 }