Update font chain linter to match latest font file

- FAMILY emoji now has own gender neutral emoji
- Some flags are newly supported
- Some regions may have the same flags.

Bug: 77148691
Test: m fontchain_lint
Change-Id: If1a69974230f025d35503eb49bea105923593e87

tools/fonts/fontchain_linter.py

@@ -486,12 +486,8 @@ def flag_sequence(territory_code):
     return tuple(0x1F1E6 + ord(ch) - ord('A') for ch in territory_code)
 
 UNSUPPORTED_FLAGS = frozenset({
-    flag_sequence('BL'), flag_sequence('BQ'), flag_sequence('DG'),
-    flag_sequence('EA'), flag_sequence('EH'), flag_sequence('FK'),
-    flag_sequence('GF'), flag_sequence('GP'), flag_sequence('GS'),
-    flag_sequence('MF'), flag_sequence('MQ'), flag_sequence('NC'),
-    flag_sequence('PM'), flag_sequence('RE'), flag_sequence('TF'),
-    flag_sequence('WF'), flag_sequence('XK'), flag_sequence('YT'),
+    flag_sequence('BL'), flag_sequence('BQ'), flag_sequence('MQ'),
+    flag_sequence('RE'), flag_sequence('TF'),
 })
 
 EQUIVALENT_FLAGS = {
@@ -531,10 +527,17 @@ LEGACY_ANDROID_EMOJI = {
 ZWJ_IDENTICALS = {
     # KISS
     (0x1F469, 0x200D, 0x2764, 0x200D, 0x1F48B, 0x200D, 0x1F468): 0x1F48F,
-    # FAMILY
-    (0x1F468, 0x200D, 0x1F469, 0x200D, 0x1F466): 0x1F46A,
 }
 
+SAME_FLAG_MAPPINGS = [
+    # Diego Garcia and British Indian Ocean Territory
+    ((0x1F1EE, 0x1F1F4), (0x1F1E9, 0x1F1EC)),
+    # St. Martin and France
+    ((0x1F1F2, 0x1F1EB), (0x1F1EB, 0x1F1F7)),
+    # Spain and Ceuta & Melilla
+    ((0x1F1EA, 0x1F1F8), (0x1F1EA, 0x1F1E6)),
+]
+
 ZWJ = 0x200D
 FEMALE_SIGN = 0x2640
 MALE_SIGN = 0x2642
@@ -636,6 +639,9 @@ def compute_expected_emoji():
         all_sequences.add(reversed_seq)
         equivalent_emoji[reversed_seq] = sequence
 
+    for first, second in SAME_FLAG_MAPPINGS:
+        equivalent_emoji[first] = second
+
     # Remove unsupported flags
     all_sequences.difference_update(UNSUPPORTED_FLAGS)