patches: fix Corfu Zoom tracking — replace rate-limit with parent-frame guard

Root cause: the 50ms rate limit broke child-frame (Corfu) tracking.
When the Corfu child frame redraws, its ns_update_end fires first and
resets the rate-limit timer.  When the parent frame's ns_update_end
fires immediately after, the timer has not expired, so
ns_zoom_track_completion returns early without scanning child frames.
Zoom focus stays on the first candidate.

Fix: remove the rate limit; add a FRAME_PARENT_FRAME(f) guard instead.
Child frames have no completion children to scan; their parent's
ns_update_end does the scan via FOR_EACH_FRAME.  Returning early on
child-frame calls avoids the redundant scan and leaves the timer
problem moot.  Overhead without the rate limit is ~40 Lisp evaluations
per redisplay (~5-20 µs), acceptable given ns_zoom_enabled_p() already
caches the UAZoomEnabled() IPC call.

patches/0000-ns-integrate-with-macOS-Zoom-for-cursor-tracking.patch

@@ -1,4 +1,4 @@
-From d494967af08ec3e5bb94ff50126c2994505a6d85 Mon Sep 17 00:00:00 2001
+From aeab7e4db306049fb543f60cadcaaa346350f77b Mon Sep 17 00:00:00 2001
 From: Martin Sukany <martin@sukany.cz>
 Date: Sat, 28 Feb 2026 22:39:35 +0100
 Subject: [PATCH 1/9] ns: integrate with macOS Zoom for cursor tracking
@@ -38,8 +38,8 @@ window splits, switches (C-x o), and completion frameworks.
 ---
  etc/NEWS     |  11 ++
  src/nsterm.h |   6 +
- src/nsterm.m | 339 +++++++++++++++++++++++++++++++++++++++++++++++++++
- 3 files changed, 356 insertions(+)
+ src/nsterm.m | 336 +++++++++++++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 353 insertions(+)
 
 diff --git a/etc/NEWS b/etc/NEWS
 index ef36df5..80661a9 100644
@@ -81,10 +81,10 @@ index 7c1ee4c..ea6e7ba 100644
  }
  
 diff --git a/src/nsterm.m b/src/nsterm.m
-index 74e4ad5..6527750 100644
+index 74e4ad5..5498d7a 100644
 --- a/src/nsterm.m
 +++ b/src/nsterm.m
-@@ -1081,6 +1081,271 @@ static NSRect constrain_frame_rect(NSRect frameRect, bool isFullscreen)
+@@ -1081,6 +1081,268 @@ static NSRect constrain_frame_rect(NSRect frameRect, bool isFullscreen)
  }
  
  
@@ -268,18 +268,15 @@ index 74e4ad5..6527750 100644
 +    return;
 +  if (!WINDOWP (f->selected_window))
 +    return;
-+
-+  /* Rate-limit completion scan to 20 Hz (50 ms).  UAZoomEnabled() is
-+     now cached so the main cost is the overlay/child-frame scan.
-+     50 ms is imperceptible for completion navigation while preventing
-+     per-frame FOR_EACH_FRAME overhead.  */
-+  {
-+    static CFAbsoluteTime last_check;
-+    CFAbsoluteTime now = CFAbsoluteTimeGetCurrent ();
-+    if (now - last_check < 0.05)
-+      return;
-+    last_check = now;
-+  }
++  /* Child frames (e.g. the Corfu popup itself) have no children to
++     scan for completion candidates; their parent frame's ns_update_end
++     will scan them via FOR_EACH_FRAME.  Return early to avoid a
++     redundant O(frames) scan on every child-frame redisplay cycle.
++     Note: the rate limit that was here caused corfu tracking to fail:
++     the child frame's ns_update_end reset the timer, so the parent
++     frame's subsequent ns_update_end returned early without scanning.  */
++  if (FRAME_PARENT_FRAME (f))
++    return;
 +
 +  specpdl_ref count = SPECPDL_INDEX ();
 +  record_unwind_current_buffer ();
@@ -356,7 +353,7 @@ index 74e4ad5..6527750 100644
  static void
  ns_update_end (struct frame *f)
  /* --------------------------------------------------------------------------
-@@ -1104,6 +1369,41 @@ static NSRect constrain_frame_rect(NSRect frameRect, bool isFullscreen)
+@@ -1104,6 +1366,41 @@ static NSRect constrain_frame_rect(NSRect frameRect, bool isFullscreen)
  
    unblock_input ();
    ns_updating_frame = NULL;
@@ -398,7 +395,7 @@ index 74e4ad5..6527750 100644
  }
  
  static void
-@@ -3232,6 +3532,45 @@ Note that CURSOR_WIDTH is meaningful only for (h)bar cursors.
+@@ -3232,6 +3529,45 @@ Note that CURSOR_WIDTH is meaningful only for (h)bar cursors.
    /* Prevent the cursor from being drawn outside the text area.  */
    r = NSIntersectionRect (r, ns_row_rect (w, glyph_row, TEXT_AREA));