lib/ignore: Add directory separator to glob.Compile call

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3674
LGTM: calmh

lib/ignore/ignore_test.go

@@ -737,3 +737,35 @@ func TestIssue3639(t *testing.T) {
 		t.Error("Should not match 'foo'")
 	}
 }
+
+func TestIssue3674(t *testing.T) {
+	stignore := `
+	a*b
+	a**c
+	`
+
+	testcases := []struct {
+		file    string
+		matches bool
+	}{
+		{"ab", true},
+		{"asdfb", true},
+		{"ac", true},
+		{"asdfc", true},
+		{"as/db", false},
+		{"as/dc", true},
+	}
+
+	pats := New(true)
+	err := pats.Parse(bytes.NewBufferString(stignore), ".stignore")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for _, tc := range testcases {
+		res := pats.Match(tc.file).IsIgnored()
+		if res != tc.matches {
+			t.Errorf("Matches(%q) == %v, expected %v", tc.file, res, tc.matches)
+		}
+	}
+}