bugfix: do not allow lateral scroll in Address Explorer when showing single address from custom path

releases/Next-ChangeLog.md

@@ -14,11 +14,12 @@ This lists the new changes that have not yet been published in a normal release.
 - Enhancement: Improve side-channel protection: libsecp256k1 context randomization now happens
   before each signing session.
 - Change: Do NOT require descriptor checksum when importing multisig wallets
-- Bugfix: Do not alow to import multisig wallet duplicate with only keys shuffled.
+- Bugfix: Do not allow to import multisig wallet duplicate with only keys shuffled.
 - Bugfix: Do not read whole PSBT into memory when writing finalized transaction.
 - Bugfix: Properly handle null data in `OP_RETURN`.
 - Bugfix: Prevent user from restoring Seed XOR when len parts is smaller than 2.
 - Bugfix: Fix display alignment of Seed Vault menu.
+- Bugfix: Do not allow lateral scroll in Address Explorer when showing single address from custom path.
 - Change: Remove Lamp Test from Debug Options (lights covered by selftest)
 
 # Mk4 Specific Changes

shared/address_explorer.py

@@ -386,7 +386,9 @@ Press (3) if you really understand and accept these risks.
 
             elif choice == '0' and allow_change:
                 change = 1
-
+            elif n is None:
+                # makes no sense to do any of below, showing just single address
+                continue
             elif ch in (KEY_LEFT+"7"):
                 # go backwards in explorer
                 if start - n < 0:

testing/test_address_explorer.py

@@ -464,6 +464,10 @@ def test_custom_path(path_sidx, which_fmt, addr_vs_path, pick_menu_item, goto_ad
     time.sleep(.2)
 
     if is_single:
+        # check that lateral scrolling on single address does not cause the yikes
+        need_keypress(KEY_RIGHT if is_q1 else "9")
+        need_keypress(KEY_LEFT if is_q1 else "7")
+
         time.sleep(.2)
         title, body = cap_story()
         assert 'Showing single addr' in body
@@ -501,7 +505,6 @@ def test_custom_path(path_sidx, which_fmt, addr_vs_path, pick_menu_item, goto_ad
         f_path, f_addr = next(addr_gen)
         assert f_path == path
         assert f_addr == addr
-
     else:
         n = 10
         if (start_idx + n) > MAX_BIP32_IDX: