pull up r19856 from trunk

pull up r19856 from trunk

 r19856@cathode-dark-space:  jaltman | 2007-08-24 10:29:37 -0400
 ticket: new
 subject: NIM: Context menu selection issues
 component: windows

 The handler for WM_CONTEXTMENU in the credentials view of Network
 Identity Manager assumed that the context menu was invoked using the
 mouse.  If it was, then the message parameters would specify the x and
 y co-ordinates of the mouse.  The context menu can also be invoked via
 the keyboard, in which case the x- and y- coordinates are set to
 (-1,-1).

 An additional problem with the code is that it was not selecting the
 row that was right-clicked on if it was not already selected.  This
 results in the some of the commands on the context menu targetting
 credentials that the user didn't intend to target.

 This patch adds support for handling the context menu when it is
 invoked via the keyboard and also sets the selection to the row that
 was right-clicked if the user invokes the context menu using the
 mouse.

ticket: 5677
version_fixed: 1.6.3

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-6@19991 dc483132-0cff-0310-8789-dd5450dbe970