Fix sorting of files/dirs in dialogs

Sorts leading `_` before other characters except `.`.

1 files changed, 8 insertions, 0 deletions

diff --git a/tests/core/string/test_string.h b/tests/core/string/test_string.h
index da742d0183..027dcac92d 100644
--- a/tests/core/string/test_string.h
+++ b/tests/core/string/test_string.h
@@ -336,6 +336,14 @@ TEST_CASE("[String] Natural compare function test") {
 	CHECK(a.naturalnocasecmp_to("img10.png") < 0);
 }
 
+TEST_CASE("[String] File compare function test") {
+	String a = "_img2.png";
+
+	CHECK(a.nocasecmp_to("img10.png") > 0);
+	CHECK_MESSAGE(a.filenocasecmp_to("img10.png") < 0, "Should sort before letters.");
+	CHECK_MESSAGE(a.filenocasecmp_to(".img10.png") > 0, "Should sort after period.");
+}
+
 TEST_CASE("[String] hex_encode_buffer") {
 	static const uint8_t u8str[] = { 0x45, 0xE3, 0x81, 0x8A, 0x8F, 0xE3 };
 	String s = String::hex_encode_buffer(u8str, 6);