add -e: ignore dirty submodules

We cannot add untracked/modified files in submodules anyway.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

builtin/add.c

@@ -278,6 +278,7 @@ static int edit_patch(int argc, const char **argv, const char *prefix)
 
 	argc = setup_revisions(argc, argv, &rev, NULL);
 	rev.diffopt.output_format = DIFF_FORMAT_PATCH;
+	DIFF_OPT_SET(&rev.diffopt, IGNORE_DIRTY_SUBMODULES);
 	out = open(file, O_CREAT | O_WRONLY, 0644);
 	if (out < 0)
 		die (_("Could not open '%s' for writing."), file);