fix: enclose rounded preferred timings in EDID ranges

dev/check-edid.py

@@ -77,6 +77,8 @@ with tempfile.TemporaryDirectory(prefix='qemu-edid-probe-') as temporary:
         (144000, 60000, 1920, 1080, 144),
         (144000, 0, 1600, 900, 144),
         (0, 144000, 1920, 1080, 144),
+        (50000, 0, 1920, 1080, 50),
+        (255000, 0, 1280, 800, 255),
     ]:
         data = subprocess.check_output([str(directory / 'probe'), *map(str, (configured, frontend, width, height))])
         assert all(sum(data[offset:offset + 128]) % 256 == 0 for offset in range(0, len(data), 128)), 'invalid EDID checksum'
@@ -93,6 +95,6 @@ with tempfile.TemporaryDirectory(prefix='qemu-edid-probe-') as temporary:
         assert ranges[5] <= actual <= ranges[6], f'vertical range {ranges[5:7]} excludes {actual}'
         horizontal_khz = clock / (horizontal + hblank) / 1000
         assert ranges[7] <= horizontal_khz <= ranges[8], f'horizontal range {ranges[7:9]} excludes {horizontal_khz}'
-        if expected <= 75:
+        if configured == 0 and expected <= 75:
             assert ranges[5:9] == bytes((50, 125, 30, 160)), 'legacy monitor range changed'
         print(f'PASS configured={configured}, frontend={frontend}: {width}x{height}@{actual:.6f}, ranges={list(ranges[5:9])}')