🚀 go-pugleaf

In GNU Emacs 18.55.5 of Thu Dec  7 1989 on mizar (berkeley-unix)

Emacs doesn't do focus management (for highlighting the cursor), as
src/x11term.c states in function internal_socket_read().  Instead it
does Enter/Leave window management, which is not really relevant.
Well, I got irritated on it (since I use twm with TitleFocus), and
looked at it.

I'm no Xpert, but it seems to work if you simply change the case
EnterNotify/LeaveNotify pair with FocusIn/FocusOut, and change the
XSelectInput call in XInitWindow to use FocusChangeMask instead of
EnterWindowMask | LeaveWindowMask.  Perhaps some Xpert can tell me if
this is the wrong way of doing things, or if I'll get bitten by some
evil side effect?

-- Bjorn Victor			victor@DoCS.UU.SE
Dept. of Computer Systems    or victor%DoCS.UU.SE@uunet.UU.NET
Uppsala University, Sweden	"I'd rather hack a Lisp Machine!"


The patch:
*** /usr/share/local/src/gnu/emacs-18.55/src/x11term.c	Thu Aug  3 04:56:42 1989
--- /home/mizar/docs/victor/emacs/18.55/src/x11term.c	Thu Dec 14 18:15:59 1989
***************
*** 1314,1326 ****
         * still show a filled cursor whenever the pointer
         * enters the emacs window.
         */
!     case EnterNotify:
        CursorToggle ();
        CursorOutline = 0;
        CursorToggle ();
        break;
  
!     case LeaveNotify:
        CursorToggle ();
        CursorOutline = 1;
        CursorToggle ();
--- 1314,1328 ----
         * still show a filled cursor whenever the pointer
         * enters the emacs window.
         */
! /*    case EnterNotify: */
!     case FocusIn:		/* Focus management *seems* this simple... */
        CursorToggle ();
        CursorOutline = 0;
        CursorToggle ();
        break;
  
! /*    case LeaveNotify: */
!     case FocusOut:		/* Focus management... */
        CursorToggle ();
        CursorOutline = 1;
        CursorToggle ();
***************
*** 2386,2392 ****
  
      XSelectInput(XXdisplay, XXwindow, KeyPressMask |
  		 ExposureMask | ButtonPressMask | ButtonReleaseMask |
! 		 EnterWindowMask | LeaveWindowMask |
  		 StructureNotifyMask);
  
      XMapWindow (XXdisplay, XXwindow);
--- 2388,2395 ----
  
      XSelectInput(XXdisplay, XXwindow, KeyPressMask |
  		 ExposureMask | ButtonPressMask | ButtonReleaseMask |
! /*		 EnterWindowMask | LeaveWindowMask | */
! 		 FocusChangeMask | 		/* Focus management */
  		 StructureNotifyMask);
  
      XMapWindow (XXdisplay, XXwindow);