I've tested the following setups: (1) Emacs master, pdf-tools 1.1.0 (2) Emacs 29.4, pdf-tools 1.1.0
The issue appears with (1) but not (2), so I figured I'd report it as a bug with Emacs rather than pdf-tools, but would welcome other suggestions. Steps to reproduce: 1. Install pdf-tools (e.g., via list-packages) 2. Emacs -Q 3. Evaluate the following: (package-initialize) (use-package pdf-tools :config (pdf-tools-install :no-query)) 4. Visit any pdf file. These steps put Emacs in a state where tooltips behave badly: when the current frame is fullscreen (via (toggle-frame-fullscreen)), tooltips display in a separate fullscreen frame rather than as a child frame. All tooltips are affected, not just those produced by pdf-tools. For example, (x-show-tip "This is a tooltip." (selected-frame) nil 5) triggers the issue, as does mousing over any link in *Help*. In GNU Emacs 31.0.50 (build 4, aarch64-apple-darwin23.6.0, NS appkit-2487.70 Version 14.6.1 (Build 23G93)) of 2024-09-05 built on d51735 Repository revision: df57e44a08fd5c7dc159254a40f5d2e4d008e8df Repository branch: master Windowing system distributor 'Apple', version 10.3.2487 System Description: macOS 14.6.1 Configured using: 'configure --with-ns --with-native-compilation --with-tree-sitter --with-gif --with-png --with-jpeg --with-rsvg --with-tiff --with-imagemagick --with-x-toolkit=gtk3 --with-xwidgets' Configured features: ACL DBUS GLIB GNUTLS IMAGEMAGICK LCMS2 LIBXML2 MODULES NATIVE_COMP NOTIFY KQUEUE NS PDUMPER PNG RSVG SQLITE3 THREADS TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM XWIDGETS ZLIB Important settings: value of $LC_CTYPE: UTF-8 value of $LANG: en_US.UTF-8 locale-coding-system: utf-8-unix Major mode: Text Minor modes in effect: pdf-occur-global-minor-mode: t repeat-mode: t override-global-mode: t recentf-mode: t display-time-mode: t save-place-mode: t global-auto-revert-mode: t minibuffer-depth-indicate-mode: t electric-pair-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 tab-bar-history-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t minibuffer-regexp-mode: t column-number-mode: t line-number-mode: t transient-mark-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t Load-path shadows: /Users/au710211/.emacs.d/elpa/lispy-20230314.1738/elpa hides /Users/au710211/.emacs.d/elpa/ivy-20240405.2019/elpa /Users/au710211/.emacs.d/elpa/editorconfig-20240318.2049/editorconfig hides /Users/au710211/gnu-emacs/nextstep/Emacs.app/Contents/Resources/lisp/editorconfig /Users/au710211/.emacs.d/elpa/which-key-20240423.1320/which-key hides /Users/au710211/gnu-emacs/nextstep/Emacs.app/Contents/Resources/lisp/which-key /Users/au710211/.emacs.d/elpa/editorconfig-20240318.2049/editorconfig-core hides /Users/au710211/gnu-emacs/nextstep/Emacs.app/Contents/Resources/lisp/editorconfig-core /Users/au710211/.emacs.d/elpa/editorconfig-20240318.2049/editorconfig-conf-mode hides /Users/au710211/gnu-emacs/nextstep/Emacs.app/Contents/Resources/lisp/editorconfig-conf-mode /Users/au710211/.emacs.d/elpa/ef-themes-1.7.0/theme-loaddefs hides /Users/au710211/gnu-emacs/nextstep/Emacs.app/Contents/Resources/lisp/theme-loaddefs /Users/au710211/.emacs.d/elpa/transient-20240421.1737/transient hides /Users/au710211/gnu-emacs/nextstep/Emacs.app/Contents/Resources/lisp/transient /Users/au710211/.emacs.d/elpa/editorconfig-20240318.2049/editorconfig-core-handle hides /Users/au710211/gnu-emacs/nextstep/Emacs.app/Contents/Resources/lisp/editorconfig-core-handle /Users/au710211/.emacs.d/elpa/editorconfig-20240318.2049/editorconfig-fnmatch hides /Users/au710211/gnu-emacs/nextstep/Emacs.app/Contents/Resources/lisp/editorconfig-fnmatch Features: (shadow sort mail-extr emacsbug magit-base magit-section cursor-sensor crm dash compat etags fileloop generator xref shortdoc help-fns radix-tree mm-archive misearch multi-isearch package-vc lisp-mnt network-stream url-cache url-http url-auth url-gw nsm display-line-numbers add-log vc-hg vc-git diff-mode track-changes vc-bzr vc-src vc-sccs vc-svn vc-cvs vc-rcs log-view pcvs-util vc vc-dispatcher dired-aux ol-eww eww xdg url-queue mm-url ol-rmail ol-mhe ol-irc ol-info ol-gnus nnselect gnus-art mm-uu mml2015 mm-view mml-smime smime gnutls dig gnus-sum shr pixel-fill kinsoku url-file svg dom gnus-group gnus-undo gnus-start gnus-dbus dbus xml gnus-cloud nnimap nnmail mail-source utf7 nnoo parse-time gnus-spec gnus-int gnus-range message sendmail yank-media puny rfc822 mml mml-sec epa derived epg rfc6068 epg-config mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 ietf-drums 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