Flameshot won't copy to clipboard if started from CLI

Flameshot Version

$ flameshot --version
Flameshot v12.1.0 ()
Compiled with Qt 5.15.3

Installation Type

Snap from Ubuntu software center

Operating System type and version

Ubuntu 22.04.3 LTS

Description

If you open flameshot gui without the flameshot daemon running (system tray icon), then copying to clipboard via CTRL+C fails. If the daemon is open, then copying to clipboard works.

This issue was created from a comment on a closed issue https://github.com/flameshot-org/flameshot/issues/635#issuecomment-1693404726

There's new information and repeatable steps.

Steps to reproduce

1. Ensure flameshot is completely closed (no system tray icon).
2. Start flameshot directly from the terminal via flameshot gui while there's not flameshot system tray icon.
3. Use CTRL+C to copy to clipboard.

Note following the above steps copying to clipboard fails. If you open flameshot GUI from application menu and the system tray icon is open, then flameshot will copy to clipboard successfully.

Screenshots or screen recordings

No response

System Information

# Ubuntu 22.04.3 LTS
# Linux 6.2.0-31-generic x86_64
# GNU bash, version 5.1.16(1)-release (x86_64-pc-linux-gnu)
# Flameshot v12.1.0 ()
# snap    2.60.3

Using X11 for display instead of wayland.