M-x send-invisible can leave display unusable

This bug report will be sent to the XEmacs Development Team, not to your local site managers!! Please write in English, because the XEmacs maintainers do not have translators to read other languages for them. Please describe as succinctly as possible: - What happened. - What you thought should have happened. - Precisely what you were doing at the time. Please also include any C or lisp back-traces that you may have. ================================================================ Dear Bug Team! (I reported a similar bug before against an old and unmaintained version of XEmacs; it's still there in 21.4.8 so I am reporting it again.) M-x send-invisible inverts the screen to type in the password. But it can get into a confused state where it leaves the screen permanently inverted, or worse, partly inverted (eg white text on white background). This tends to happen if a 'Password:' prompt is printed in a shell buffer, causing send-invisible to trigger automatically, at the same time as the user tries to run M-x send-invisible manually. The white-on-white problem happened when I tried to abort entry of a password by hitting C-c C-c in the shell buffer and C-g at the XEmacs password prompt. Because the display became unusable afterwards I was unable to do M-x view-lossage and see exactly what happened. I've noticed that with my X server (on a remote machine) the display inversion happens slowly, taking a noticeable fraction of a second. So what may have happened is that I interrupted send-invisible with C-g while it was restoring the old display colours, and so left them in a half-inverted state. I don't know whether a typical user would be as likely as me to panic and hit C-g repeatedly when send-invisible starts triggering without being asked. But it seems dangerous to have a command which if interrupted makes the display unusable. Maybe send-invisible could disable C-g while it does the display changes. Or alternatively it might not invert the display at all, since this doesn't seem to be necessary (certainly it serves no security purpose). ================================================================ System Info to help track down your bug: --------------------------------------- uname -a: Linux astest 2.4.9-e.8smp #1 SMP Fri Jul 19 15:38:30 EDT 2002 i686 unknown unknown GNU/Linux ./configure 'i386-redhat-linux-gnu' '--prefix=/usr' '--exec-prefix=/usr' '--bindir=/usr/bin' '--datadir=/usr/share' '--libdir=/usr/lib' '--mandir=/usr/share/man/man1' '--infodir=/usr/share/info' '--with-gpm=no' '--with-sound=native' '--with-pop' '--mail-locking=lockf' '--with-clash-detection' '--debug=no' '--error-checking=none' '--with-mule=yes' '--with-database=berkdb' '--with-ldap=yes' '--with-hesiod=no' '--with-canna=yes' '--with-wnn=yes' '--with-widgets=motif' '--with-menubars=lucid' '--with-scrollbars=lucid' '--with-dialogs=motif' '--with-xim=xlib' '--with-msw=no' '--with-xfs=yes' '--pdump' XEmacs 21.4.8 "Honest Recruiter" configured for `i386-redhat-linux'. Compilation / Installation: Source code location: /usr/src/build/141167-i386/BUILD/xemacs-21.4.8 Installation prefix: /usr Operating system description file: `s/linux.h' Machine description file: `m/intel386.h' Compiler: gcc -O2 -march=i386 -mcpu=i686 Relocating allocator for buffers: no GNU version of malloc: yes - Using Doug Lea's new malloc from the GNU C Library. Window System: Compiling in support for the X window system: - X Windows headers location: /usr/X11R6/include - X Windows libraries location: /usr/X11R6/lib - Handling WM_COMMAND properly. Using Lucid menubars. Using Lucid scrollbars. Using Motif dialog boxes. Using Motif native widgets. TTY: Compiling in support for ncurses. Images: Compiling in support for GIF images (builtin). Compiling in support for XPM images. Compiling in support for PNG images. Compiling in support for JPEG images. Compiling in support for TIFF images. Sound: Compiling in support for sound (native). Databases: Compiling in support for Berkeley database. Compiling in support for LDAP. Compiling in support for PostgreSQL. - Using PostgreSQL header file: libpq-fe.h - Using PostgreSQL V7 bindings. Internationalization: Compiling in support for Mule (multi-lingual Emacs). Compiling in support for XIM (X11R5+ I18N input method). - Using raw Xlib to provide XIM support. - Using XFontSet to provide bilingual menubar. Compiling in support for Canna on Mule. Compiling in support for the WNN input method on Mule. Mail: Compiling in support for POP mail retrieval. Compiling in support for "lockf" mail spool file locking method. Other Features: Inhibiting IPv6 canonicalization at startup. Compiling in support for dynamic shared object modules. Using the new portable dumper. Load-Path Lisp Shadows: ---------------------- (/usr/lib/xemacs/xemacs-packages/lisp/apel/alist /usr/share/xemacs-21.4.8/lisp/alist) Installed XEmacs Packages: ------------------------- ((zenirc:version 1.13 :type regular) (xslt-process :version 1.1 :type regular) (xslide :version 1.02 :type regular) (xemacs-devel :version 1.47 :type single-file) (xemacs-base :version 1.66 :type regular) (w3 :version 1.25 :type regular) (vm :version 7.07 :type regular) (viper :version 1.34 :type regular) (view-process :version 1.11 :type regular) (vhdl :version 1.15 :type regular) (vc-cc :version 1.21 :type regular) (vc :version 1.33 :type regular) (tramp :version 1.05 :type regular) (tpu :version 1.12 :type regular) (tooltalk :version 1.13 :type regular) (tm :version 1.34 :type regular) (time :version 1.11 :type regular) (textools :version 1.12 :type regular) (text-modes :version 1.48 :type single-file) (texinfo :version 1.2 :type regular) (supercite :version 1.19 :type regular) (strokes :version 1.08 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easymenu iso8859-1 page buff-menu lib-complete cus-file derived frame text-props obsolete cus-start custom widget cl-extra mini-cl cl cl-19 packages backquote very-early-lisp postgresqlv7 postgresql CANNA file-coding wnn mule lucid-scrollbars cut-buffer lucid-menubars motif-dialogs x c-balloon-help tty-frames tty toolbar native-sound scrollbar unix-processes multicast network-streams subprocesses modules menu-accelerator-support menubar berkeley-db md5 xemacs xim gutter tiff png gif jpeg xpm xbm lisp-float-type linux dialog devices window-system base64) Recent keystrokes: ----------------- r m a t i o n SPC o n SPC a l l C-e SPC i n SPC a SPC p a r t i c u l a r SPC A f t e r m a t h SPC o r SPC I n f e r n o SPC i n s t a n c e . RET up M-q down down C-d C-x # y c d BS BS M-x s h e l l RET M-x r e p o t BS r t SPC x e m SPC b u SPC RET Recent messages (most recent first): ----------------------------------- Loading xemacsbug...done Loading xemacsbug... Wrote /tmp/cvsBBYQpw Save file /tmp/cvsBBYQpw? (y or n) Yes Save file /tmp/cvsBBYQpw? (y or n) Type `C-x #' to finish editing Completed Completing file name... Completed Completing file name... Making completion list... History item: 1 Making completion list... History item: 6 History item: 3 ~/datatech_dev/perldbmaint/bin/ History item: 6 History item: 6 History item: 3 ~/datatech_dev/