Subject: bug#61948: closed (Re: bug#61948: 29.0.60; window-at returns nil when tab-bar-mode is on)

From: [email-masked] (GNU bug Tracking System)
Date: Sat, 04 Mar 2023 09:19:02 +0000

Your bug report

#61948: 29.0.60; window-at returns nil when tab-bar-mode is on

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to [email-masked].

-- 
61948: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=61948
GNU Bug Tracking System
Contact [email-masked] with problems

Subject: Re: bug#61948: 29.0.60; window-at returns nil when tab-bar-mode is on
From: Yuan Fu <[email-masked]>
To: Eli Zaretskii <[email-masked]>
Cc: [email-masked], [email-masked]
Date: Sat, 4 Mar 2023 01:18:02 -0800
List-Id: <debbugs-submit.debbugs.gnu.org>

> On Mar 4, 2023, at 12:50 AM, Eli Zaretskii <[email-masked]> wrote:
> 
>> From: Yuan Fu <[email-masked]>
>> Date: Fri, 3 Mar 2023 19:02:06 -0800
>> 
>> To reproduce:
>> 
>> 1. Type C-x t 2 to turn on tab-bar-mode
>> 2. Evaluate (window-at 0 0), it returns nil
>> 3. Evaluating (window-at 50 50) also returns nil
>> 4. Turn off tab-bar-mode, and (window-at 0 0) returns a live window
>> 
>> window-at-x-y is the same
> 
> What did you expect the function to return instead in these cases?
> 
> Both of these functions ignore the tool-bar and the tab-bar
> pseudo-windows, so as long as the coordinates are inside those two
> windows, both functions return nil.  (This was not called out in their
> doc strings; I've now added this caveat to the doc strings of these
> two functions.)
> 
> So the call with both X and Y zero returns nil because that point is
> within the area of the frame where these functions always return nil.
> 
> As for the call with X and Y being 50, it returns nil for different
> reasons:
> 
>  . for window-at, X and Y are measured in columns and rows, so likely
>    Y = 50 is outside of the frame created by "emacs -Q";
>  . for window-at-x-y, Y = 50 is still inside the tab-bar
>    pseudo-window; on my system using Y = 53 or larger returns the
>    window showing *scratch*; it could be that the threshold value on
>    your system is a bit different
> 
> Given the above, do you still think there's a bug here?  If so, please
> describe the real use case where you needed this.
> 
> Thanks.

Ah! Should’ve tried (window-at-x-y 100 100). In my brain 50 pixels is pretty far so I thought (50 . 50) must be in a window.

Indeed, it’s a false alarm. Sorry for the noise. 

Yuan

Subject: 29.0.60; window-at returns nil when tab-bar-mode is on
From: Yuan Fu <[email-masked]>
To: Bug Report Emacs <[email-masked]>
Date: Fri, 3 Mar 2023 19:02:06 -0800
List-Id: <debbugs-submit.debbugs.gnu.org>

To reproduce:

1. Type C-x t 2 to turn on tab-bar-mode
2. Evaluate (window-at 0 0), it returns nil
3. Evaluating (window-at 50 50) also returns nil
4. Turn off tab-bar-mode, and (window-at 0 0) returns a live window

window-at-x-y is the same

In GNU Emacs 29.0.60 (build 58, x86_64-apple-darwin22.3.0, NS
appkit-2299.40 Version 13.2.1 (Build 22D68)) of 2023-03-01 built on
Brown
Repository revision: 59365f928565f1be551b1697b9246b00cb87a9b7
Repository branch: emacs-29
Windowing system distributor 'Apple', version 10.3.2299
System Description:  macOS 13.2.1

Configured features:
ACL DBUS GLIB GNUTLS JSON LCMS2 LIBXML2 MODULES NOTIFY KQUEUE NS PDUMPER
PNG RSVG SQLITE3 THREADS TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM ZLIB

Important settings:
  value of $LC_CTYPE: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  buffer-read-only: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message mailcap yank-media puny dired
dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068
epg-config gnus-util mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mail-utils shortdoc text-property-search help-fns
radix-tree time-date subr-x cl-extra help-mode icons cl-loaddefs cl-lib
rmc iso-transl tooltip cconv eldoc paren electric uniquify ediff-hook
vc-hooks lisp-float-type elisp-mode mwheel term/ns-win ns-win
ucs-normalize mule-util term/common-win tool-bar dnd fontset image
regexp-opt fringe tabulated-list replace newcomment text-mode lisp-mode
prog-mode register page tab-bar menu-bar rfn-eshadow isearch easymenu
timer select scroll-bar mouse jit-lock font-lock syntax font-core
term/tty-colors frame minibuffer nadvice seq simple cl-generic
indonesian philippine cham georgian utf-8-lang misc-lang vietnamese
tibetan thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
composite emoji-zwj charscript charprop case-table epa-hook
jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button loaddefs
theme-loaddefs faces cus-face macroexp files window text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget keymap
hashtable-print-readable backquote threads dbusbind kqueue cocoa ns
lcms2 multi-tty make-network-process emacs)

Memory information:
((conses 16 46845 11136)
(symbols 48 5645 0)
(strings 32 14791 2011)
(string-bytes 1 398282)
(vectors 16 10157)
(vector-slots 8 156538 31644)
(floats 8 80 19)
(intervals 56 649 42)
(buffers 984 14))