commit b9ddda6c2d98d99c09d58145c1b5b4042a8fd92c
author Bram Moolenaar <Bram@vim.org> Tue Feb 19 23:00:50 2019 +0100
committer Bram Moolenaar <Bram@vim.org> Tue Feb 19 23:00:50 2019 +0100
tree b9ad408dfdd16ffd01276e8b583ff208133bf153
parent 66ae3d199fdcd732eb79266e913e4e6d2e82ee76

patch 8.1.0956: using context:0 in 'diffopt' does not work well

Problem:    Using context:0 in 'diffopt' does not work well.
Solution:   Make zero context do the same as one line context. (closes #4005)

src/diff.c

diff --git a/src/diff.c b/src/diff.c
index 9220c72..336157c 100644
--- a/src/diff.c
+++ b/src/diff.c
@@ -2277,7 +2277,7 @@
 	    tp->tp_diff_invalid = TRUE;
 
     diff_flags = diff_flags_new;
-    diff_context = diff_context_new;
+    diff_context = diff_context_new == 0 ? 1 : diff_context_new;
     diff_foldcolumn = diff_foldcolumn_new;
     diff_algorithm = diff_algorithm_new;