txexplorer: goto index

diff --git a/shared/auth.py b/shared/auth.py
index 91b96e7..f91ad4f 100644
--- a/shared/auth.py
+++ b/shared/auth.py
@@ -14,7 +14,7 @@ from sffile import SFFile
 from menu import MenuSystem, MenuItem
 from serializations import ser_uint256, SIGHASH_ALL
 from ux import ux_show_story, abort_and_goto, ux_dramatic_pause, ux_clear_keys, ux_confirm
-from ux import show_qr_code, OK, X, abort_and_push, AbortInteraction, the_ux
+from ux import show_qr_code, OK, X, abort_and_push, AbortInteraction, the_ux, ux_enter_number
 from usb import CCBusyError
 from utils import (HexWriter, xfp2str, problem_file_line, cleanup_deriv_path, B2A,
                    show_single_address, keypath_to_str, seconds2human_readable)
@@ -1546,6 +1546,8 @@ class TXExplorer:
         if offset:
             rv += ', LEFT to go back'
 
+        rv += ", (2) to go to index"
+
         if not version.has_qwerty:
             # Q has hint key
             rv += ", (4) to show QR code"
@@ -1563,7 +1565,7 @@ class TXExplorer:
         msg, addrs, change, end = self.make_ux_msg(start, self.n)
 
         while True:
-            ch = await ux_show_story(msg, title=self.title, escape='479'+KEY_RIGHT+KEY_LEFT+KEY_QR,
+            ch = await ux_show_story(msg, title=self.title, escape='2479'+KEY_RIGHT+KEY_LEFT+KEY_QR,
                                      hint_icons=KEY_QR)
             if ch == 'x':
                 del msg
@@ -1577,17 +1579,20 @@ class TXExplorer:
                                     qr_msgs=self.qr_msgs, no_index=bool(self.qr_msgs))
                 continue
             elif ch in (KEY_LEFT+"7"):
-                if (start - self.n) < 0:
-                    continue
-                else:
-                    # go backwards in explorer
-                    start -= self.n
+                if not start: continue # 0
+                start = max(start - self.n, 0)
+
             elif ch in (KEY_RIGHT+"9"):
                 if (start + self.n) >= self.max_items:
                     continue
                 else:
                     # go forwards
                     start += self.n
+            elif ch == "2":
+                max_v = self.max_items - 1
+                res = await ux_enter_number("Start Idx (0-%d):" % max_v, max_value=max_v)
+                if res is None: continue
+                start = res
             else:
                 # nothing changed - do not recalc msg
                 continue
diff --git a/testing/test_sign.py b/testing/test_sign.py
index 0365b71..54cbc47 100644
--- a/testing/test_sign.py
+++ b/testing/test_sign.py
@@ -20,7 +20,7 @@ from constants import ADDR_STYLES, ADDR_STYLES_SINGLE, SIGHASH_MAP, simulator_fi
 from txn import *
 from ctransaction import CTransaction, CTxOut, CTxIn, COutPoint
 from ckcc_protocol.constants import STXN_VISUALIZE, STXN_SIGNED
-from charcodes import KEY_QR, KEY_RIGHT
+from charcodes import KEY_QR, KEY_RIGHT, KEY_LEFT
 
 
 SEQUENCE_LOCKTIME_TYPE_FLAG = (1 << 22)
@@ -3561,4 +3561,68 @@ def test_unknown_input_script(stype, fake_txn , start_sign, cap_story, use_testn
     assert title == "OK TO SEND?"
     txin_explorer(len(ins), ins)
 
+
+def test_tx_explorer_goto_idx(fake_txn, start_sign, cap_story, use_testnet, need_keypress,
+                              pick_menu_item, cap_screen, enter_number, press_cancel, is_q1):
+    use_testnet()
+    num_ins = 27
+    num_outs = 32
+
+    psbt = fake_txn(num_ins, num_outs, segwit_in=True, change_outputs=[0])
+    start_sign(psbt)
+    title, story = cap_story()
+    assert title == "OK TO SEND?"
+    need_keypress("2")
+    pick_menu_item("Inputs")
+    time.sleep(.1)
+    title, story = cap_story()
+    assert "(2)" in story
+
+    need_keypress("2")
+    time.sleep(.1)
+    scr = cap_screen()
+    assert f"0-{num_ins - 1}" in scr
+    enter_number(15)
+    time.sleep(.1)
+    title, story = cap_story()
+    assert title == "Input 15"
+
+    need_keypress("2")
+    enter_number(1)
+    time.sleep(.1)
+    title, story = cap_story()
+    assert title == "Input 1"
+
+    need_keypress("2")
+    enter_number(59)  # over max
+    time.sleep(.1)
+    title, story = cap_story()
+    assert title == f"Input {num_ins - 1}"
+    press_cancel()
+
+    pick_menu_item("Outputs")
+    time.sleep(.1)
+    title, story = cap_story()
+    assert "(2)" in story
+    need_keypress("2")
+    enter_number(4)
+    time.sleep(.1)
+    title, story = cap_story()
+    assert title == f"4-{4 + 10 - 1}"
+
+    # try to move left
+    need_keypress(KEY_LEFT if is_q1 else "7")
+
+    time.sleep(.1)
+    title, story = cap_story()
+    assert title == f"0-9"
+
+    need_keypress("2")
+    enter_number(59)
+    time.sleep(.1)
+    title, story = cap_story()
+    num = num_outs - 1
+    assert title == f"{num}-{num}"
+
+
 # EOF