GNU bug report logs - #76084
31.0.50; Dragging tab line does not resize windows, unlike header line or mode line

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Subject: Re: bug#76084: 31.0.50; Dragging tab line does not resize windows,
 unlike header line or mode line
To: Jared Finder <jared@HIDDEN>
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 > The code in xdisp.c that updates the mouse icon for dragging the mode
 > line (search for "draggable") is straightforward to adjust to also
 > handle the header and tab lines.  That works for almost all cases, I
 > can confirm it works fine for Info mode, tab-line mode, and
 > window-tool-bar mode.

Can you do that?

 > It doesn't work for ruler-mode still because
 > ruler-mode sets its own binding for <header-line> <down-mouse-1> in
 > its keymap.
 >
 > To handle this I would need to add checks against the down-mouse-1
 > keybinding before setting the mouse icon.  I'm just worried about
 > performance here since looking up the keymap would get run on mouse
 > motion.

I think there's no reason to bother about 'ruler-mode'.  IIRC, apart
from the scroll bar, the ruler has no "empty space" and dragging should
mostly happen in a horizontal fashion.

martin

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Subject: Re: bug#76084: 31.0.50; Dragging tab line does not resize windows,
 unlike header line or mode line
To: Juri Linkov <juri@HIDDEN>
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 >> I attach a patch for this that hopefully does not negatively affect
 >> 'tab-line-mouse-move-tab'.  Juri will have to check.
 >
 > Thanks!  I confirm everything works nicely.

Pushed now.

 > Also changing the mouse cursor while dragging the tab-line tab with
 > 'tab-line-mouse-move-tab' would be nice to do.  But it seems
 > this is not simple to do, and need to add something like
 > 'tab_bar__dragging_in_progress'.

I think you should do that but maybe use a more generic name like
'drag_item_in_progress' so one could use it for tool bar items too.

martin

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To: martin rudalics <rudalics@HIDDEN>
Subject: Re: bug#76084: 31.0.50; Dragging tab line does not resize windows,
 unlike header line or mode line
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On 2025-02-06 01:01, martin rudalics wrote:
>> Dragging on empty space in the tab line does not resize windows.  This
>> is unlike the behavior when dragging on empty space in the mode line 
>> or
>> in the header line.
> 
> I attach a patch for this that hopefully does not negatively affect
> 'tab-line-mouse-move-tab'.  Juri will have to check.
> 
>> Additionally, hovering the mouse pointer over empty space on the the
>> header line, while it does resize the window, does not display the
>> "resize up down" icon.  This behiavor is differnt from when you hover
>> the mouse pointer over the empty space on the mode line.
> 
> I suppose this will have to be done separately when specifying a header
> line format (like, for example, 'ruler-mode' does).

The code in xdisp.c that updates the mouse icon for dragging the mode 
line (search for "draggable") is straightforward to adjust to also 
handle the header and tab lines.  That works for almost all cases, I can 
confirm it works fine for Info mode, tab-line mode, and window-tool-bar 
mode. It doesn't work for ruler-mode still because ruler-mode sets its 
own binding for <header-line> <down-mouse-1> in its keymap.

To handle this I would need to add checks against the down-mouse-1 
keybinding before setting the mouse icon.  I'm just worried about 
performance here since looking up the keymap would get run on mouse 
motion.

   -- MJF

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Subject: Re: bug#76084: 31.0.50; Dragging tab line does not resize windows,
 unlike header line or mode line
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>> Dragging on empty space in the tab line does not resize windows.  This
>> is unlike the behavior when dragging on empty space in the mode line or
>> in the header line.
>
> I attach a patch for this that hopefully does not negatively affect
> 'tab-line-mouse-move-tab'.  Juri will have to check.

Thanks!  I confirm everything works nicely.

>> Additionally, hovering the mouse pointer over empty space on the the
>> header line, while it does resize the window, does not display the
>> "resize up down" icon.  This behiavor is differnt from when you hover
>> the mouse pointer over the empty space on the mode line.
>
> I suppose this will have to be done separately when specifying a header
> line format (like, for example, 'ruler-mode' does).

Also changing the mouse cursor while dragging the tab-line tab with
'tab-line-mouse-move-tab' would be nice to do.  But it seems
this is not simple to do, and need to add something like
'tab_bar__dragging_in_progress'.

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This is a multi-part message in MIME format.
--------------UAI00bRMK2o81yDds9Ob3MrB
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 > Dragging on empty space in the tab line does not resize windows.  This
 > is unlike the behavior when dragging on empty space in the mode line or
 > in the header line.

I attach a patch for this that hopefully does not negatively affect
'tab-line-mouse-move-tab'.  Juri will have to check.

 > Additionally, hovering the mouse pointer over empty space on the the
 > header line, while it does resize the window, does not display the
 > "resize up down" icon.  This behiavor is differnt from when you hover
 > the mouse pointer over the empty space on the mode line.

I suppose this will have to be done separately when specifying a header
line format (like, for example, 'ruler-mode' does).

martin
--------------UAI00bRMK2o81yDds9Ob3MrB
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Dragging on empty space in the tab line does not resize windows.  This
is unlike the behavior when dragging on empty space in the mode line or
in the header line.

Additionally, hovering the mouse pointer over empty space on the the
header line, while it does resize the window, does not display the
"resize up down" icon.  This behiavor is differnt from when you hover
the mouse pointer over the empty space on the mode line.

(this is secondary bug filing requested in bug#75844)

   -- MJF

In GNU Emacs 31.0.50 (build 10, x86_64-pc-linux-gnu, GTK+ Version
  3.24.38, cairo version 1.16.0) of 2025-02-05 built on electric-egg
Repository revision: ea04dd8ca93d609c0ee475c4acf58a56dfc0f1f3
Repository branch: HEAD
Windowing system distributor 'Microsoft Corporation', version 
11.0.12010000
System Description: Debian GNU/Linux 12 (bookworm)

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP
NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE XIM XINERAMA XINPUT2 XPM
XRANDR GTK3 ZLIB

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

Major mode: Info

Minor modes in effect:
   tab-line-mode: t
   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
   isearch-fold-quotes-mode: t
   global-font-lock-mode: t
   font-lock-mode: t
   blink-cursor-mode: t
   minibuffer-regexp-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 tab-line icons info time-date cl-loaddefs
cl-lib compile text-property-search comint subr-x ansi-osc ansi-color
ring comp-run bytecomp byte-compile comp-common rx ruler-mode rmc
iso-transl tooltip cconv eldoc paren electric uniquify ediff-hook
vc-hooks lisp-float-type elisp-mode mwheel term/x-win x-win
term/common-win x-dnd touch-screen 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 inotify lcms2 dynamic-setting system-font-setting
font-render-setting cairo gtk x-toolkit xinput2 x multi-tty move-toolbar
make-network-process tty-child-frames native-compile emacs)

Memory information:
((conses 16 87290 9777) (symbols 48 7255 0) (strings 32 23302 2118)
  (string-bytes 1 771807) (vectors 16 13945)
  (vector-slots 8 170553 12886) (floats 8 33 40)
  (intervals 56 2441 157) (buffers 992 14))