Package: emacs;
Reported by: Justus-dev <at> Piater.name
Date: Wed, 16 Jul 2025 15:50:02 UTC
Severity: normal
Found in version 30.1
Message #8 received at 79032 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: Justus-dev <at> Piater.name, Po Lu <luangruo <at> yahoo.com> Cc: 79032 <at> debbugs.gnu.org Subject: Re: bug#79032: 30.1; Stylus (Wacom Pen) Support under Wayland Date: Wed, 16 Jul 2025 19:40:04 +0300
> Date: Wed, 16 Jul 2025 17:48:58 +0200 > From: Justus-dev--- via "Bug reports for GNU Emacs, > the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org> > > In a text-mode buffer I'd generally expect the stylus to behave like the > mouse-1 button (press-drag-release highlights a text region), but it > does not. In the following, "cursor" refers to Emacs' text cursor, and > "pointer" refers to the graphical pointer controlled by the mouse and > the stylus. > > 1. Start emacs -Q in a Wayland session. In the *scratch* buffer: > > 2. Use the mouse to move the pointer over a text character (without > pressing a button). > > 3. Tap a different character with the stylus (pen-down). > > Expected effect: The cursor is placed at the pen-down location. > > Actual effect: The cursor is placed at the location where the pointer > was before pen-down, and the region of text between cursor and > pointer (now at the pen-down location) is highlighted. > > 4. Drag the stylus. > > Expected effect: Pointer and cursor follow the stylus, and the region > between pen-down and cursor is highlighted. > > Actual effect: Pointer follows stylus, but cursor and highlighted > region remain unchanged. > > 5. Lift the stylus (pen-up). > > Expected and actual effect: The cursor is located at the pen-up > location, and the region between pen-down and pen-up is highlighted. > > 6. Iterate Steps 3-5. The above description always holds. In particular, > at Step 3, "the location where the pointer was before pen-down" is > > if the mouse was moved since the preceding pen-up (as in Step 2): > the pointer location where the mouse left it before pen-down, > > otherwise: > the preceding pen-up location. > > Both are, of course, unexpected behavior. > > After Steps 1-5, C-h l gives me the following: > > <help-echo> <down-mouse-1> ;; mouse-drag-region > <mouse-movement> ;; anonymous-command > ... [repeats many times] > <mouse-movement> ;; anonymous-command > <drag-mouse-1> ;; mouse-set-region > C-h l ;; view-lossage Thanks. This seems to imply that the stylus doesn't produce mouse-up events in this case? Because otherwise, you should have seen <mouse-1> events as well. Po Lu, any ideas? Is this a known issue with Wayland? > This behavior makes it impossible to use the stylus for drawing inside > Emacs, e.g. using artist-mode or el-easydraw > (https://github.com/misohena/el-easydraw/issues/40). > > This behavior appears to be specific to Wayland, perhaps even to my > compositor (swaywm). In particular, X (by default) appears to treat the > stylus like the mouse: > > - xev (running under Xwayland) reports stylus interactions as mouse > events, but wev reports stylus interactions as "zwp_tablet_tool_v2" > events. > > - If I run Emacs under Xwayland (GDK_BACKEND=X11 emacs -Q), the stylus > behaves identically to the mouse. > > Thus, for starters, it would be interesting if other Wayland users, > using the same or different compositors, observe the same behavior. > > > In GNU Emacs 30.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.49, > cairo version 1.18.4) > System Description: Arch Linux > > Configured using: > 'configure --with-pgtk --sysconfdir=/etc --prefix=/usr > --libexecdir=/usr/lib --localstatedir=/var --disable-build-details > --with-cairo --with-harfbuzz --with-libsystemd --with-modules > --with-native-compilation=aot --with-tree-sitter 'CFLAGS=-march=x86-64 > -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=3 > -Wformat -Werror=format-security -fstack-clash-protection > -fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -g > -ffile-prefix-map=/build/emacs/src=/usr/src/debug/emacs -flto=auto' > 'LDFLAGS=-Wl,-O1 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro > -Wl,-z,now -Wl,-z,pack-relative-relocs -flto=auto' > 'CXXFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions > -Wp,-D_FORTIFY_SOURCE=3 -Wformat -Werror=format-security > -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer > -mno-omit-leaf-frame-pointer -Wp,-D_GLIBCXX_ASSERTIONS -g > -ffile-prefix-map=/build/emacs/src=/usr/src/debug/emacs -flto=auto'' > > Configured features: > ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG > LCMS2 LIBOTF LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY > PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF > TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM GTK3 ZLIB > > Important settings: > value of $LC_COLLATE: de_AT.UTF-8 > value of $LC_MONETARY: de_AT.UTF-8 > value of $LC_TIME: de_AT.UTF-8 > value of $LANG: en_US.UTF-8 > locale-coding-system: utf-8-unix > > Major mode: Help > > 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 > 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 text-property-search time-date subr-x mm-decode > mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader > sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils > help-mode cl-loaddefs cl-lib rmc iso-transl tooltip cconv eldoc paren > electric uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel > term/pgtk-win pgtk-win term/common-win touch-screen pgtk-dnd 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 > dynamic-setting system-font-setting font-render-setting cairo gtk pgtk > lcms2 multi-tty move-toolbar make-network-process native-compile emacs) > > Memory information: > ((conses 16 53221 8904) (symbols 48 5611 0) (strings 32 14333 3337) > (string-bytes 1 471846) (vectors 16 9250) > (vector-slots 8 128560 7593) (floats 8 26 35) (intervals 56 286 4) > (buffers 992 12)) > > > >
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