Patch 8.1.0956
Problem:    Using context:0 in 'diffopt' does not work well.
Solution:   Make zero context do the same as one line context. (closes #4005)
Files:      src/diff.c, src/testdir/test_diffmode.vim,
            src/testdir/dumps/Test_diff_06.0.dump,
            src/testdir/dumps/Test_diff_06.1.dump,
            src/testdir/dumps/Test_diff_06.2.dump


*** ../vim-8.1.0955/src/diff.c  2019-02-15 21:06:05.334289769 +0100
--- src/diff.c  2019-02-19 22:48:57.940746351 +0100
***************
*** 2277,2283 ****
            tp->tp_diff_invalid = TRUE;
  
      diff_flags = diff_flags_new;
!     diff_context = diff_context_new;
      diff_foldcolumn = diff_foldcolumn_new;
      diff_algorithm = diff_algorithm_new;
  
--- 2277,2283 ----
            tp->tp_diff_invalid = TRUE;
  
      diff_flags = diff_flags_new;
!     diff_context = diff_context_new == 0 ? 1 : diff_context_new;
      diff_foldcolumn = diff_foldcolumn_new;
      diff_algorithm = diff_algorithm_new;
  
*** ../vim-8.1.0955/src/testdir/test_diffmode.vim       2018-12-04 
22:24:12.193693584 +0100
--- src/testdir/test_diffmode.vim       2019-02-19 22:58:57.241162183 +0100
***************
*** 783,788 ****
--- 783,799 ----
    call WriteDiffFiles(buf, [1, 2, 3, 4, 4, 5, 6, 7, 8, 9, 10], [1, 2, 3, 4, 
5, 6, 7, 8, 9, 10, 11])
    call VerifyBoth(buf, 'Test_diff_06', '')
  
+   " Variants on test 6 with different context settings
+   call term_sendkeys(buf, ":set diffopt+=context:2\<cr>")
+   call VerifyScreenDump(buf, 'Test_diff_06.2', {})
+   call term_sendkeys(buf, ":set diffopt-=context:2\<cr>")
+   call term_sendkeys(buf, ":set diffopt+=context:1\<cr>")
+   call VerifyScreenDump(buf, 'Test_diff_06.1', {})
+   call term_sendkeys(buf, ":set diffopt-=context:1\<cr>")
+   call term_sendkeys(buf, ":set diffopt+=context:0\<cr>")
+   call VerifyScreenDump(buf, 'Test_diff_06.0', {})
+   call term_sendkeys(buf, ":set diffopt-=context:0\<cr>")
+ 
    " Test 7 - 9: Test normal/patience/histogram diff algorithm
    call WriteDiffFiles(buf, ['#include <stdio.h>', '', '// Frobs foo 
heartily', 'int frobnitz(int foo)', '{',
        \ '    int i;', '    for(i = 0; i < 10; i++)', '    {', '        
printf("Your answer is: ");',
*** ../vim-8.1.0955/src/testdir/dumps/Test_diff_06.0.dump       2019-02-19 
22:59:57.128800249 +0100
--- src/testdir/dumps/Test_diff_06.0.dump       2019-02-19 22:56:37.406005390 
+0100
***************
*** 0 ****
--- 1,20 ----
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@11|A|l@1
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*** ../vim-8.1.0955/src/testdir/dumps/Test_diff_06.1.dump       2019-02-19 
22:59:57.132800224 +0100
--- src/testdir/dumps/Test_diff_06.1.dump       2019-02-19 22:43:30.442648520 
+0100
***************
*** 0 ****
--- 1,20 ----
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@11|A|l@1
+ |:+0&&|s|e|t| |d|i|f@1|o|p|t|+|=|c|o|n|t|e|x|t|:|1| @51
*** ../vim-8.1.0955/src/testdir/dumps/Test_diff_06.2.dump       2019-02-19 
22:59:57.132800224 +0100
--- src/testdir/dumps/Test_diff_06.2.dump       2019-02-19 22:43:29.386654543 
+0100
***************
*** 0 ****
--- 1,20 ----
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@11|A|l@1
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*** ../vim-8.1.0955/src/version.c       2019-02-19 21:40:22.617135352 +0100
--- src/version.c       2019-02-19 23:00:04.592755112 +0100
***************
*** 781,782 ****
--- 781,784 ----
  {   /* Add new patch number below this line */
+ /**/
+     956,
  /**/

-- 
I think that you'll agree that engineers are very effective in their social
interactions.  It's the "normal" people who are nuts.
                                (Scott Adams - The Dilbert principle)

 /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net   \\\
///        sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
\\\  an exciting new programming language -- http://www.Zimbu.org        ///
 \\\            help me help AIDS victims -- http://ICCF-Holland.org    ///

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