fix: say why the plan's numbers differ

install.py

@@ -12044,8 +12044,14 @@ def _plan_lines(check: dict, dest: Path | None, state: TuiState) -> list:
     ]
     if state.facts.get("writable") is False:
         lines.append("You cannot write to this folder: choose another one.")
-    lines.append(f"{check['present']} in place, {check['missing']} missing, "
-                 f"{wrong} wrong {'copy' if wrong == 1 else 'copies'}")
+    counts = (f"{check['present']} in place, {check['missing']} missing, "
+              f"{wrong} wrong {'copy' if wrong == 1 else 'copies'}")
+    if copied and fetch:
+        # 47 to download above 49 missing and 1 wrong copy: the 3 found on
+        # this machine are the difference, said where the sum is read.
+        counts += (f": {len(copied)} of them {'is' if len(copied) == 1 else 'are'} "
+                   f"copied from this machine, {fetch} downloaded")
+    lines.append(counts)
     saves = (state.saves if check is state.check
              else state.dry_saves if check is state.dry else None)
     lines += [_styled(line, "path") for line in _saves_lines(state, saves)]

tests/test_install_tui.py

@@ -3908,6 +3908,19 @@ class TheFolderScreenSaysWhatItOffers(unittest.TestCase):
                 self.assertEqual(rows[state.focus["folder"]].action, "browse")
 
 
+class ThePlanNumbersAddUp(unittest.TestCase):
+    """"47 files to download" sat above "49 missing, 1 wrong copy": the 3
+    found on this machine were the difference, left to the reader."""
+
+    def test_the_copied_files_are_the_difference(self):
+        state = checked_state()
+        state.found = [found("scph5500.bin", str(SYSTEM_DIR), "one folder too deep")]
+        screen = " ".join(" ".join(install.tui_view(state, 120, 40)).split())
+        self.assertIn("3 files to download", screen)
+        self.assertIn("1 in place, 3 missing, 1 wrong copy: 1 of them is copied from this "
+                      "machine, 3 downloaded", screen)
+
+
 class NothingFoundIsSaid(unittest.TestCase):
     """With nothing detected the first screen was the list of 18 setups,
     with no line at 40x15 saying nothing was found, which the beginner's