Patch 8.2.0977
Problem:    t_8u is made empty for the wrong terminals. (Dominique Pelle)
Solution:   Invert the check for TPR_YES. (closes #6254)
Files:      src/term.c, src/testdir/test_termcodes.vim


*** ../vim-8.2.0976/src/term.c  2020-06-13 16:39:28.247393573 +0200
--- src/term.c  2020-06-14 14:33:14.661696200 +0200
***************
*** 4637,4642 ****
--- 4637,4643 ----
        // "xterm-256color" but are not fully xterm compatible.
        //
        // Gnome terminal sends 1;3801;0, 1;4402;0 or 1;2501;0.
+       // Newer Gnome-terminal sends 65;6001;1.
        // xfce4-terminal sends 1;2802;0.
        // screen sends 83;40500;0
        // Assuming any version number over 2500 is not an
***************
*** 4688,4694 ****
  
        // Unless the underline RGB color is expected to work, disable "t_8u".
        // It does not work for the real Xterm, it resets the background color.
!       if (term_props[TPR_UNDERLINE_RGB].tpr_status == TPR_YES && *T_8U != NUL)
            T_8U = empty_option;
  
        // Only set 'ttymouse' automatically if it was not set
--- 4689,4695 ----
  
        // Unless the underline RGB color is expected to work, disable "t_8u".
        // It does not work for the real Xterm, it resets the background color.
!       if (term_props[TPR_UNDERLINE_RGB].tpr_status != TPR_YES && *T_8U != NUL)
            T_8U = empty_option;
  
        // Only set 'ttymouse' automatically if it was not set
*** ../vim-8.2.0976/src/testdir/test_termcodes.vim      2020-06-13 
15:47:21.070282268 +0200
--- src/testdir/test_termcodes.vim      2020-06-14 14:32:36.357847663 +0200
***************
*** 1013,1018 ****
--- 1013,1020 ----
    call test_override('term_props', 1)
  
    set ttymouse=xterm
+   " t_8u is not reset
+   let &t_8u = "\<Esc>[58;2;%lu;%lu;%lum"
    call test_option_not_set('ttymouse')
    let seq = "\<Esc>[>1;95;0c"
    call feedkeys(seq, 'Lx!')
***************
*** 1025,1030 ****
--- 1027,1033 ----
          \ underline_rgb: 'y',
          \ mouse: 's'
          \ }, terminalprops())
+   call assert_equal("\<Esc>[58;2;%lu;%lu;%lum", &t_8u)
  
    " Reset is_not_xterm and is_mac_terminal.
    set t_RV=
***************
*** 1158,1166 ****
          \ mouse: 's'
          \ }, terminalprops())
  
!   " xterm >= 279: "sgr" and cursor_style not reset
    set ttymouse=xterm
    call test_option_not_set('ttymouse')
    let seq = "\<Esc>[>0;279;0c"
    call feedkeys(seq, 'Lx!')
    call assert_equal(seq, v:termresponse)
--- 1161,1170 ----
          \ mouse: 's'
          \ }, terminalprops())
  
!   " xterm >= 279: "sgr" and cursor_style not reset; also check t_8u reset
    set ttymouse=xterm
    call test_option_not_set('ttymouse')
+   let &t_8u = "\<Esc>[58;2;%lu;%lu;%lum"
    let seq = "\<Esc>[>0;279;0c"
    call feedkeys(seq, 'Lx!')
    call assert_equal(seq, v:termresponse)
***************
*** 1172,1177 ****
--- 1176,1182 ----
          \ underline_rgb: 'u',
          \ mouse: 's'
          \ }, terminalprops())
+   call assert_equal('', &t_8u)
  
    set t_RV=
    call test_override('term_props', 0)
*** ../vim-8.2.0976/src/version.c       2020-06-14 13:50:51.747717715 +0200
--- src/version.c       2020-06-14 14:33:50.277555005 +0200
***************
*** 756,757 ****
--- 756,759 ----
  {   /* Add new patch number below this line */
+ /**/
+     977,
  /**/

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