Xpra: Ticket #2366: some tcl/tk dialog can not close

Looks like some tcl/tk application dialog can not close.
I found the code 'grab -global .dialog2' in tcl script that make a mistake.

1. Xpra Version

[root@CentOS241 irony]# rpm -qa | grep xpra
python2-xpra-server-2.5.3-1.r23270.el7_6.x86_64
xpra-2.5.3-1.r23270.el7_6.x86_64
ffmpeg-xpra-4.1.1-1.el7_6.x86_64
libvpx-xpra-1.8.0-1.el7_6.x86_64
x264-xpra-20190109-0.el7_6.x86_64
xpra-html5-2.5.2-0.r22875.el7_6.noarch
xpra-common-server-2.5.3-1.r23270.el7_6.noarch
python2-pyopengl-3.1.1a1-10xpra1.el7_6.x86_64
python2-xpra-client-2.5.3-1.r23270.el7_6.x86_64
xpra-common-2.5.3-1.r23270.el7_6.noarch
libwebp-xpra-1.0.0-1.el7_6.x86_64
python2-rencode-1.0.6-1.xpra1.el7_6.x86_64
python2-xpra-2.5.3-1.r23270.el7_6.x86_64
pygtkglext-1.1.0-27.xpra3.el7_6.x86_64
xorg-x11-drv-dummy-0.3.8-1.xpra2.el7.x86_64
xpra-common-client-2.5.3-1.r23270.el7_6.noarch

2. dummy version

[root@CentOS241 irony]# rpm -qa | grep drv-dummy
xorg-x11-drv-dummy-0.3.8-1.xpra2.el7.x86_64

3. xpra config

[root@CentOS241 irony]# xpra showconfig
Warning: running as root
add-printer-options            = '-E', '-o printer-is-shared=false', '-u allow:$USER'
attach                         = None
auth                           = []
auto-refresh-delay             = 0.15
av-sync                        = True
bandwidth-detection            = True
bandwidth-limit                = 'auto'
bell                           = True
bind                           = 'auto'
bind-rfb                       = []
bind-ssh                       = []
bind-ssl                       = []
bind-tcp                       = []
bind-udp                       = []
bind-vsock                     = []
bind-ws                        = []
bind-wss                       = []
border                         = 'auto,5:off'
challenge-handlers             = 'all'
chdir                          = ''
clipboard                      = 'yes'
clipboard-direction            = 'both'
clipboard-filter-file           = ''
compression_level              = 1
compressors                    = 'lz4', 'lzo', 'zlib'
csc-modules                    = 'swscale', 'libyuv'
cursors                        = True
daemon                         = True
dbus-control                   = True
dbus-launch                    = 'dbus-launch --sh-syntax --close-stderr'
dbus-proxy                     = True
debug                          = ''
delay-tray                     = False
desktop-fullscreen             = False
desktop-scaling                = 'auto'
display                        = ''
displayfd                      = 0
download-path                  = '~'
dpi                            = 0
encoding                       = 'auto'
encodings                      = 'h264', 'vp9', 'vp8', 'mpeg4', 'mpeg4+mp4', 'h264+mp4', 'vp8+webm', 'vp9+webm', 'png', 'png/P', 'png/L', 'webp', 'rgb', 'rgb24', 'rgb32', 'jpeg', 'h265', 'jpeg2000', 'mpeg1', 'mpeg2'
encryption                     = ''
encryption-keyfile             = ''
env                            = []
exec-wrapper                   = ''
exit-ssh                       = True
exit-with-children             = False
exit-with-client               = False
fake-xinerama                  = True
file-size-limit                = 100
file-transfer                  = 'auto'
forward-xdg-open               = True
gid                            = 0
global-menus                   = True
html                           = 'auto'
idle-timeout                   = 0
input-devices                  = 'auto'
input-method                   = 'none'
key-shortcut                   = 'Control+Menu:toggle_keyboard_grab', 'Shift+Menu:toggle_pointer_grab', 'Shift+F11:toggle_fullscreen', '#+F1:show_menu', '#+F2:show_start_new_command', '#+F3:show_bug_report', '#+F4:quit', '#+F5:increase_quality', '#+F6:decrease_quality', '#+F7:increase_speed', '#+F8:decrease_speed', '#+F10:magic_key', '#+F11:show_session_info', '#+F12:toggle_debug', '#+plus:scaleup', '#+minus:scaledown', '#+underscore:scaledown', '#+KP_Add:scaleup', '#+KP_Subtract:scaledown', '#+KP_Multiply:scalereset', '#+bar:scalereset', '#+question:scalingoff'
keyboard-layout                = ''
keyboard-layouts               = []
keyboard-options               = ''
keyboard-raw                   = False
keyboard-sync                  = True
keyboard-variant               = ''
keyboard-variants              = []
local-clipboard                = 'CLIPBOARD'
lock                           = None
log-dir                        = 'auto'
log-file                       = '$DISPLAY.log'
lpadmin                        = '/usr/sbin/lpadmin'
lpinfo                         = '/usr/sbin/lpinfo'
max-size                       = ''
mdns                  (used)   = False                             <type 'bool'>
mdns                 (default) = True                              <type 'bool'>
microphone            (used)   = 'off'                             <type 'str'>
microphone           (default) = 'disabled'                        <type 'str'>
microphone-codec               = []
min-port                       = 1024
min-quality                    = 30
min-size                       = ''
min-speed                      = 30
mmap                           = 'yes'
mmap-group                     = 'auto'
modal-windows                  = False
mousewheel                     = 'on'
notifications                  = True
open-command                   = '/usr/bin/xdg-open'
open-files                     = 'auto'
open-url                       = 'auto'
opengl                         = 'probe'
packet-encoders                = 'rencode', 'bencode', 'yaml'
password                       = ''
password-file                  = []
pdf-printer                    = '/usr/share/ppd/cupsfilters/Generic-PDF_Printer-PDF.ppd'
pidfile                        = ''
pings                          = 5
pixel-depth                    = 0
postscript-printer             = 'drv:///sample.drv/generic.ppd'
printing                       = 'yes'
proxy-start-sessions           = True
proxy-video-encoders           = []
pulseaudio                     = None
pulseaudio-command             = 'pulseaudio --start -n --daemonize=false --system=false --exit-idle-time=-1 --load=module-suspend-on-idle '--load=module-null-sink sink_name="Xpra-Speaker" sink_properties=device.description="Xpra\ Speaker"' '--load=module-null-sink sink_name="Xpra-Microphone" sink_properties=device.description="Xpra\ Microphone"' '--load=module-native-protocol-unix socket=$XPRA_PULSE_SERVER' --load=module-dbus-protocol --load=module-x11-publish --log-level=2 --log-target=stderr --enable-memfd=no'
pulseaudio-configure-commands           = 'pactl set-default-sink Xpra-Speaker', 'pactl set-default-source Xpra-Microphone.monitor'
quality                        = 0
readonly                       = False
remote-clipboard               = 'CLIPBOARD'
remote-logging                 = 'both'
remote-xpra                    = '$XDG_RUNTIME_DIR/xpra/run-xpra', 'xpra', '/usr/local/bin/xpra', '~/.xpra/run-xpra'
resize_display                 = True
rfb-auth                       = []
rfb-upgrade                    = 5
server-idle-timeout            = 0
session-name                   = ''
sharing                        = None
shortcut-modifiers             = 'auto'
socket-dir                     = ''
socket-dirs                    = '/run/user/$UID/xpra', '/run/xpra'
socket-permissions             = '600'
sound-source                   = ''
speaker               (used)   = 'on'                              <type 'str'>
speaker              (default) = 'disabled'                        <type 'str'>
speaker-codec                  = []
speed                          = 0
ssh                            = 'auto'
ssh-auth                       = []
ssh-upgrade                    = True
ssl                            = 'auto'
ssl-auth                       = []
ssl-ca-certs                   = 'default'
ssl-ca-data                    = ''
ssl-cert                       = ''
ssl-check-hostname             = False
ssl-ciphers                    = 'DEFAULT'
ssl-client-verify-mode           = 'optional'
ssl-key                        = ''
ssl-options                    = 'ALL,NO_COMPRESSION'
ssl-protocol                   = 'SSLv23'
ssl-server-hostname            = 'localhost'
ssl-server-verify-mode           = 'required'
ssl-verify-flags               = 'X509_STRICT'
start                          = []
start-after-connect            = []
start-child                    = []
start-child-after-connect           = []
start-child-on-connect           = []
start-child-on-last-client-exit           = []
start-env                      = '#avoid Ubuntu's global menu, which is a mess and cannot be forwarded:', 'UBUNTU_MENUPROXY=', 'QT_X11_NO_NATIVE_MENUBAR=1', '#fix for MainSoft's MainWin buggy window management:', 'MWNOCAPTURE=true', 'MWNO_RIT=true', 'MWWM=allwm', '#force GTK3 applications to use X11 so we can intercept them:', 'GDK_BACKEND=x11', '#force Qt applications to use X11 so we can intercept them:', 'QT_QPA_PLATFORM=xcb', '#overlay scrollbars complicate things:GTK_OVERLAY_SCROLLING=0', '#some versions of GTK3 honour this option, sadly not all:', 'GTK_CSD=0', '#silence some AT-SPI and atk-bridge warnings:', 'NO_AT_BRIDGE=1'
start-new-commands             = False
start-on-connect               = []
start-on-last-client-exit           = []
start-via-proxy                = False
sync-xvfb                      = 0
system-proxy-socket            = '/run/xpra/system'
system-tray                    = True
systemd-run                    = 'no'
systemd-run-args               = ''
tcp-auth                       = []
tcp-encryption                 = ''
tcp-encryption-keyfile           = ''
tcp-proxy                      = ''
terminate-children             = False
title                          = '@title@ on @client-machine@'
tray                           = True
tray-icon                      = ''
udp-auth                       = []
uid                            = 0
use-display                    = False
username                       = 'root'
video-decoders                 = 'avcodec2', 'vpx'
video-encoders                 = 'x264', 'vpx', 'nvenc', 'ffmpeg'
video-scaling                  = 'auto'
vsock-auth                     = []
webcam                         = 'auto'
window-close                   = 'auto'
window-icon                    = ''
windows                        = True
wm-name                        = 'Xpra'
ws-auth                        = []
wss-auth                       = []
xsettings                      = True
xvfb                           = 'xpra_Xdummy -noreset -novtswitch -nolisten tcp +extension GLX +extension RANDR +extension RENDER -auth $XAUTHORITY -logfile ${XPRA_LOG_DIR}/Xorg.${DISPLAY}.log -configdir ${XDG_RUNTIME_DIR}/xpra/xorg.conf.d/$PID -config /etc/xpra/xorg.conf'

4. Server log

https://www.xpra.org/trac/attachment/ticket/2366/Server_Logs.txt

5. start command

xpra start --bind-tcp=0.0.0.0:10011 --start=/home/irony/numeca.sh --no-daemon --debug=window

6. screenshot