X11 with flwm(tinycore-16 x86) User Feedback

[LaoFG]

Describe the bug

1. Some error message will be triggered when exiting from the tray.
2. The restarted app cannot display correctly in tray area
3. Exiting stalonetray using Ctrl C can cause the display service to break, preventing any graphical operations.
   After connecting via remote SSH, using htop shows that there are no high-usage processes on the host;
   terminating stalonetray with pkill allows it to exit normally.

To Reproduce
Steps to reproduce the buggy behavior (even if intermittent):

1. no flwm special configuration
2. Launch clipit from wbar or bash(clipit &)
3. Exit the application from the tray
4. See error
5. restart clipit ,no icon in tray area
6. Ctrl C to exiting stalonetray or Close the graphical terminal window
7. X11 display seem break

Expected behavior

1. Exit the program from the tray area, no error message is printed
2. restart clipit, clipit icon should be visible in tray area
3. Stopping stalonetray should not break any graphical services.

Log files
--log-level trace no work in 1.0.1 with meson
with --log-level info:

~/stalonetray-1.0.1/build_debug$ ./stalonetray &
[1] 6201
added icon <unknown> (wid 0xc00015) as visible
added icon clipit (wid 0x1200003) as visible
~/stalonetray-1.0.1/build_debug$ ----------- tray status -----------
active: yes
geometry: 48x24+752+573
XEMBED focus: 0x1200003
currently managed icons:
wid = 0xc00015
X11 error: BadWindow (invalid Window parameter) (request: X_ConfigureWindow, resource 0xc)
X11 error: BadWindow (invalid Window parameter) (request: X_MapWindow, resource 0x8)
  name = <unknown>
  visible = 1
  position (grid) = 1x1+0+0
  position (pixels) = 24x24+0+0
  wnd_sz = 18x18
  xembed = 0
  embedded = 1
X11 error 3 detected at ../src/debug.c:155:print_icon_data
wid = 0x1200003
X11 error: BadWindow (invalid Window parameter) (request: X_GetProperty, resource 0x14)
  name = <unknown>
  visible = 1
  position (grid) = 1x1+1+0
  position (pixels) = 24x24+24+0
  wnd_sz = 18x18
  xembed = 1
  embedded = 1
X11 error 3 detected at ../src/debug.c:155:print_icon_data
-----------------------------------
X11 error: BadWindow (invalid Window parameter) (request: X_ChangeWindowAttributes, resource 0x2)
X11 error: BadWindow (invalid Window parameter) (request: X_UnmapWindow, resource 0xa)
X11 error: BadWindow (invalid Window parameter) (request: X_ReparentWindow, resource 0x7)
X11 error: BadWindow (invalid Window parameter) (request: X_ConfigureWindow, resource 0xc)
X11 error: BadWindow (invalid Window parameter) (request: X_MapWindow, resource 0x8)
X11 error 3 detected at ../src/xutils.c:113:x11_get_server_timestamp
X11 error: BadWindow (invalid Window parameter) (request: X_SendEvent, resource 0x19)
X11 error: BadWindow (invalid Window parameter) (request: X_GetProperty, resource 0x14)
removed icon <unknown> (wid 0x1200003)
X11 error 3 detected at ../src/xutils.c:258:x11_get_window_size
----------- tray status -----------
active: yes
geometry: 48x24+752+573
XEMBED focus: none
currently managed icons:
wid = 0xc00015
  name = <unknown>
  visible = 1
  position (grid) = 1x1+0+0
  position (pixels) = 24x24+0+0
  wnd_sz = 18x18
  xembed = 0
  embedded = 1
-----------------------------------
added icon clipit (wid 0x1a00003) as hidden  

[LaoFG]

Regarding the issue(3.) of exiting stalonetray, adding the compile option -Dexit_gracefully=true helps, but there are still minor problems. After closing the terminal window running stalonetray, other windows can be opened, but they cannot be moved.