Ignore trailing whitespace in .gitignore files (as git itself does)

src/ignore.c

@@ -205,6 +205,16 @@ static int parse_ignore_file(
 			if (ignore_case)
 				match->flags |= GIT_ATTR_FNMATCH_ICASE;
 
+			while (match->length > 0) {
+				if (match->pattern[match->length - 1] == ' ' ||
+				    match->pattern[match->length - 1] == '\t') {
+					match->pattern[match->length - 1] = 0;
+					match->length --;
+				} else {
+					break;
+				}
+			}
+
 			scan = git__next_line(scan);
 
 			/*

tests/attr/ignore.c

@@ -51,6 +51,16 @@ void test_attr_ignore__allow_root(void)
 	assert_is_ignored(false, "NewFolder/NewFolder/File.txt");
 }
 
+void test_attr_ignore__ignore_space(void)
+{
+	cl_git_rewritefile("attr/.gitignore", "/\n\n/NewFolder \n/NewFolder/NewFolder");
+
+	assert_is_ignored(false, "File.txt");
+	assert_is_ignored(true, "NewFolder");
+	assert_is_ignored(true, "NewFolder/NewFolder");
+	assert_is_ignored(true, "NewFolder/NewFolder/File.txt");
+}
+
 void test_attr_ignore__ignore_root(void)
 {
 	cl_git_rewritefile("attr/.gitignore", "/\n\n/NewFolder\n/NewFolder/NewFolder");