fix: keep the pseudocode cursor/scroll when a rename re-decompiles

Renaming a symbol in the decompiler re-decompiles and refreshes (good), but the
pane rendered at the wrong scroll until the first cursor move nudged it back.
Cause: _reload_active_code only cleared loaded_ea and re-showed, and dec_scroll_y
isn't tracked on every move, so _apply_decomp fell into show()'s DERIVE branch --
a bare scroll_to that, on a freshly shown pane whose size isn't computed yet,
clamps/leaves a stale frame until the next interaction.

Now the decomp refresh snapshots the LIVE pseudocode cursor + scroll from the
widget before forcing the recompile, so _apply_decomp takes show()'s robust
_apply_scroll path (deferred re-apply + refresh(layout=True)) and repaints at the
right place immediately.

Verified on main (421-line pseudocode, 22-row viewport): before rename
cursor=54/scroll=33; after rename cursor=54/scroll=33, cursor visible -- position
preserved with no stale frame. rename/rename_history/decomp_nav/
decomp_follow_self/view_toggle/follow_xrefs/xref_labels/listing_view/
continuous_view/func_banners/search/mouse/disasm_nav green (follow_xrefs was an
ordering flake; 14/0 in isolation).

1 files changed, 12 insertions, 1 deletions

diff --git a/idatui/app.py b/idatui/app.py
index 2e00c67..122ffcc 100644
--- a/idatui/app.py
+++ b/idatui/app.py
@@ -3124,7 +3124,18 @@ class IdaTui(App):
         if cur is None:
             return
         if self._active == "decomp":
-            self.query_one(DecompView).loaded_ea = None  # force re-decompile
+            # Snapshot the LIVE pseudocode position before forcing a recompile.
+            # dec_scroll_y isn't tracked on every move, so without this the reload
+            # falls into show()'s derive path (a bare scroll_to) and leaves a
+            # stale frame until the next cursor move; capturing the real scroll
+            # makes show() take the robust _apply_scroll path and repaint now.
+            dec = self.query_one(DecompView)
+            if cur.ea == dec.loaded_ea:
+                cur.dec_cursor = dec.cursor
+                cur.dec_cursor_x = dec.cursor_x
+                cur.dec_scroll_y = round(dec.scroll_offset.y)
+                cur.dec_scroll_x = round(dec.scroll_offset.x)
+            dec.loaded_ea = None  # force re-decompile
             self._show_active()
         else:
             # Capture the LIVE listing position straight from the widget (the