Copying multiple log entries to the clipboard only copies one item

Issue Description

The log viewer has a context menu item "Copy n log entries to the clipboard", but it only copies one entry.

Steps to Reproduce Issue

  1. In the Notifications settings, go to the "Log" tab
  2. Select "always" in the "Log notifications" combobox
  3. In a terminal, run notify-send "one"
  4. In a terminal, run notify-send "two"
  5. In the log viewer, select the "one" and "two" entries
  6. Right-click on the items and select "Copy 2 log entries to the clipboard"
  7. Paste the text somewhere
    • Notice that only the data for the "one" notification was pasted

Expected Behavior

The clipboard contains data for both entries

Additional Information

N/A

Versions

  • OS distribution and version: Arch Linux
  • Overall Xfce version: 4.21
  • xfce4-notifyd version (git hash if not a release): 82b7a11b
  • Windowing system (X11/Wayland): X11
  • Compositor and version (if Wayland): N/A