git-gui: Fix "Stage/Unstage Line" with one line of context.

diff --git a/lib/diff.tcl b/lib/diff.tcl
index 96ba94906cf8037b58c2ba135654da840f9fff9a..ee7f391e2f24c418c14cacc63768da7b258e3754 100644 (file)
--- a/lib/diff.tcl
+++ b/lib/diff.tcl
@@ -423,6 +423,9 @@ proc apply_line {x y} {
                        # the line to stage/unstage
                        set ln [$ui_diff get $i_l $next_l]
                        set patch "$patch$ln"
+                       if {$c1 eq {-}} {
+                               set n [expr $n+1]
+                       }
                } elseif {$c1 ne {-} && $c1 ne {+}} {
                        # context line
                        set ln [$ui_diff get $i_l $next_l]