git-gui: Unlock the index when cancelling merge dialog

diff --git a/lib/diff.tcl b/lib/diff.tcl
index 7e715a6865858e35babf30e624c16314cdc2c2ec..29436b50cb351f88b1ebde20620729f210c37933 100644 (file)
--- a/lib/diff.tcl
+++ b/lib/diff.tcl
@@ -145,7 +145,7 @@ proc show_diff {path w {lno {}}} {
 
        lappend cmd -p
        lappend cmd --no-color
-       if {$repo_config(gui.diffcontext) > 0} {
+       if {$repo_config(gui.diffcontext) >= 0} {
                lappend cmd "-U$repo_config(gui.diffcontext)"
        }
        if {$w eq $ui_index} {