Patch 8.2.0083
Problem:    Text properties wrong when tabs and spaces are exchanged.
Solution:   Take text properties into account. (Nobuhiro Takasaki,
            closes #5427)
Files:      src/edit.c, src/testdir/test_textprop.vim


*** ../vim-8.2.0082/src/edit.c  2019-12-01 21:04:37.000000000 +0100
--- src/edit.c  2020-01-03 21:07:52.869496793 +0100
***************
*** 5601,5614 ****
            i = cursor->col - fpos.col;
            if (i > 0)
            {
!               STRMOVE(ptr, ptr + i);
                // correct replace stack.
                if ((State & REPLACE_FLAG) && !(State & VREPLACE_FLAG))
                    for (temp = i; --temp >= 0; )
                        replace_join(repl_off);
- #ifdef FEAT_PROP_POPUP
-               curbuf->b_ml.ml_line_len -= i;
- #endif
            }
  #ifdef FEAT_NETBEANS_INTG
            if (netbeans_active())
--- 5601,5620 ----
            i = cursor->col - fpos.col;
            if (i > 0)
            {
! #ifdef FEAT_PROP_POPUP
!               if (!(State & VREPLACE_FLAG))
!               {
!                   mch_memmove(ptr, ptr + i, curbuf->b_ml.ml_line_len - i
!                                          - (ptr - curbuf->b_ml.ml_line_ptr));
!                   curbuf->b_ml.ml_line_len -= i;
!               }
!               else
! #endif
!                   STRMOVE(ptr, ptr + i);
                // correct replace stack.
                if ((State & REPLACE_FLAG) && !(State & VREPLACE_FLAG))
                    for (temp = i; --temp >= 0; )
                        replace_join(repl_off);
            }
  #ifdef FEAT_NETBEANS_INTG
            if (netbeans_active())
*** ../vim-8.2.0082/src/testdir/test_textprop.vim       2019-11-16 
20:40:00.000000000 +0100
--- src/testdir/test_textprop.vim       2020-01-03 21:01:54.878743475 +0100
***************
*** 925,927 ****
--- 925,963 ----
    call assert_equal(expected, prop_list(1))
    bwipe!
  endfunc
+ 
+ func Test_textprop_noexpandtab()
+   %bwipe!
+   new
+   let save_ts = &tabstop
+   set tabstop=8
+   let save_sts = &softtabstop
+   set softtabstop=4
+   let save_sw = &shiftwidth
+   set shiftwidth=4
+   let save_et = &expandtab
+   set noexpandtab
+   let save_fdm = &foldmethod
+   set foldmethod=marker
+   call feedkeys("\<esc>\<esc>0Ca\<cr>\<esc>\<up>", "tx")
+   call prop_type_add('test', {'highlight': 'ErrorMsg'})
+   call prop_add(1, 1, {'end_col': 2, 'type': 'test'})
+   call feedkeys("0i\<tab>", "tx")
+   call prop_remove({'type': 'test'})
+   call prop_add(1, 2, {'end_col': 3, 'type': 'test'})
+   call feedkeys("A\<left>\<tab>", "tx")
+   call prop_remove({'type': 'test'})
+   try
+     " It is correct that this does not pass
+     call prop_add(1, 6, {'end_col': 7, 'type': 'test'})
+     " Has already collapsed here, start_col:6 does not result in an error
+     call feedkeys("A\<left>\<tab>", "tx")
+   catch /^Vim\%((\a\+)\)\=:E964/
+   endtry
+   call prop_remove({'type': 'test'})
+   let &foldmethod = save_fdm
+   let &expandtab = save_et
+   let &shiftwidth = save_sw
+   let &softtabstop = save_sts
+   let &tabstop = save_ts
+ endfunc
*** ../vim-8.2.0082/src/version.c       2020-01-03 20:59:55.847158293 +0100
--- src/version.c       2020-01-03 21:24:58.174165767 +0100
***************
*** 744,745 ****
--- 744,747 ----
  {   /* Add new patch number below this line */
+ /**/
+     83,
  /**/

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ANOTHER MONK:    And St.  Attila raised his hand grenade up on high saying "O
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