master e839b83c828 3/6: Reapply "Fix tty-frame-at for nested tty child frames"

[Gerd Moellmann]

branch: master
commit e839b83c828fe09546edcc46dcfc5e09dd39b9fe
Author: Gerd Möllmann <gerd@gnu.org>
Commit: Gerd Möllmann <gerd@gnu.org>

    Reapply "Fix tty-frame-at for nested tty child frames"
    
    This reverts commit 9ad28959d6895720865c0718bf60f4b7b0b144f3.
---
 src/term.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/term.c b/src/term.c
index 00bc94e6e31..7397ee68347 100644
--- a/src/term.c
+++ b/src/term.c
@@ -2603,9 +2603,11 @@ tty_frame_at (int x, int y)
     {
       Lisp_Object frame = Fcar (frames);
       struct frame *f = XFRAME (frame);
+      int fx, fy;
+      root_xy (f, 0, 0, &fx, &fy);
 
-      if (f->left_pos <= x && x < f->left_pos + f->pixel_width &&
-         f->top_pos <= y && y < f->top_pos + f->pixel_height)
+      if (fx <= x && x < fx + f->pixel_width
+         && fy <= y && y < fy + f->pixel_height)
        return frame;
     }