Patch 8.2.4490
Problem:    Terminal focus reporting only works for xterm-like terminals.
            (Jonathan Rascher)
Solution:   Remove the "focus_mode" flag. (closes #9859)
Files:      src/term.c


*** ../vim-8.2.4489/src/term.c  2022-02-13 12:13:13.606245312 +0000
--- src/term.c  2022-02-28 15:10:30.598031402 +0000
***************
*** 197,204 ****
  static int  detected_8bit = FALSE;    // detected 8-bit terminal
  
  #if (defined(UNIX) || defined(VMS))
! static int focus_mode = FALSE; // xterm's "focus reporting" availability
! static int focus_state = FALSE; // TRUE if the terminal window gains focus
  #endif
  
  #ifdef FEAT_TERMRESPONSE
--- 197,203 ----
  static int  detected_8bit = FALSE;    // detected 8-bit terminal
  
  #if (defined(UNIX) || defined(VMS))
! static int focus_state = MAYBE; // TRUE if the Vim window has focus
  #endif
  
  #ifdef FEAT_TERMRESPONSE
***************
*** 2047,2053 ****
  #endif
  
  #ifdef FEAT_MOUSE_XTERM
!     // focus reporting is supported by xterm compatible terminals and tmux.
      if (use_xterm_like_mouse(term))
      {
        char_u name[3];
--- 2046,2052 ----
  #endif
  
  #ifdef FEAT_MOUSE_XTERM
!     // Focus reporting is supported by xterm compatible terminals and tmux.
      if (use_xterm_like_mouse(term))
      {
        char_u name[3];
***************
*** 2062,2072 ****
        name[1] = KE_FOCUSLOST;
        add_termcode(name, (char_u *)"\033[O", FALSE);
  
-       focus_mode = TRUE;
-       focus_state = TRUE;
        need_gather = TRUE;
      }
  #endif
  
  #ifdef USE_TERM_CONSOLE
      // DEFAULT_TERM indicates that it is the machine console.
--- 2061,2073 ----
        name[1] = KE_FOCUSLOST;
        add_termcode(name, (char_u *)"\033[O", FALSE);
  
        need_gather = TRUE;
      }
  #endif
+ #if (defined(UNIX) || defined(VMS))
+     // First time after setting 'term' a focus event is always reported.
+     focus_state = MAYBE;
+ #endif
  
  #ifdef USE_TERM_CONSOLE
      // DEFAULT_TERM indicates that it is the machine console.
***************
*** 3633,3639 ****
  
  #if defined(UNIX) || defined(VMS)
        // Enable xterm's focus reporting mode when 'esckeys' is set.
!       if (focus_mode && p_ek && *T_FE != NUL)
            out_str(T_FE);
  #endif
  
--- 3634,3640 ----
  
  #if defined(UNIX) || defined(VMS)
        // Enable xterm's focus reporting mode when 'esckeys' is set.
!       if (p_ek && *T_FE != NUL)
            out_str(T_FE);
  #endif
  
***************
*** 3691,3697 ****
  
  #if defined(UNIX) || defined(VMS)
        // Disable xterm's focus reporting mode if 'esckeys' is set.
!       if (focus_mode && p_ek && *T_FD != NUL)
            out_str(T_FD);
  #endif
  
--- 3692,3698 ----
  
  #if defined(UNIX) || defined(VMS)
        // Disable xterm's focus reporting mode if 'esckeys' is set.
!       if (p_ek && *T_FD != NUL)
            out_str(T_FD);
  #endif
  
***************
*** 5812,5822 ****
         * Handle FocusIn/FocusOut event sequences reported by XTerm.
         * (CSI I/CSI O)
         */
!       if (focus_mode
  # ifdef FEAT_GUI
                && !gui.in_use
  # endif
-               && key_name[0] == KS_EXTRA
            )
        {
            if (key_name[1] == KE_FOCUSGAINED)
--- 5813,5822 ----
         * Handle FocusIn/FocusOut event sequences reported by XTerm.
         * (CSI I/CSI O)
         */
!       if (key_name[0] == KS_EXTRA
  # ifdef FEAT_GUI
                && !gui.in_use
  # endif
            )
        {
            if (key_name[1] == KE_FOCUSGAINED)
*** ../vim-8.2.4489/src/version.c       2022-03-02 13:13:26.479857967 +0000
--- src/version.c       2022-03-02 17:15:36.187350154 +0000
***************
*** 756,757 ****
--- 756,759 ----
  {   /* Add new patch number below this line */
+ /**/
+     4490,
  /**/

-- 
I wish there was a knob on the TV to turn up the intelligence.
There's a knob called "brightness", but it doesn't seem to work. 

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///                                                                      \\\
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