[BUG]: hang on exit

[christianrauch]

Describe the bug
PlotJuggler hangs on exit and does not quit.

To Reproduce

1. Run ros2 run plotjuggler plotjuggler.
2. Close the window via the top right "x" button.
3. I then have to press Ctrl+C to interrupt the process.

Full log:

$ ros2 run plotjuggler plotjuggler 
QSocketNotifier: Can only be used with threads started with QThread
Loading compatible plugins from directory:  "/opt/ros/jazzy/lib/plotjuggler_ros"
"/opt/ros/jazzy/lib/plotjuggler_ros/libDataLoadROS2.so is a DataLoader plugin"
"/opt/ros/jazzy/lib/plotjuggler_ros/libDataStreamROS2.so is a DataStreamer plugin"
[WARN] [1769036412.556261669] [rclcpp]: logging was initialized more than once
"/opt/ros/jazzy/lib/plotjuggler_ros/libTopicPublisherROS2.so is a StatePublisher plugin"
Loading compatible plugins from directory:  "/opt/ros/jazzy/lib/plotjuggler"
"/opt/ros/jazzy/lib/plotjuggler/libDataLoadCSV.so is a DataLoader plugin"
"/opt/ros/jazzy/lib/plotjuggler/libDataLoadMCAP.so is a DataLoader plugin"
"/opt/ros/jazzy/lib/plotjuggler/libDataLoadULog.so is a DataLoader plugin"
"/opt/ros/jazzy/lib/plotjuggler/libDataStreamSample.so is a DataStreamer plugin"  ...disabled, unless option -t is used
"/opt/ros/jazzy/lib/plotjuggler/libDataStreamUDP.so is a DataStreamer plugin"
"/opt/ros/jazzy/lib/plotjuggler/libDataStreamWebSocket.so is a DataStreamer plugin"
"/opt/ros/jazzy/lib/plotjuggler/libDataStreamZMQ.so is a DataStreamer plugin"
"/opt/ros/jazzy/lib/plotjuggler/libParserDataTamer.so is a MessageParser plugin"
"/opt/ros/jazzy/lib/plotjuggler/libParserLineInflux.so is a MessageParser plugin"
"/opt/ros/jazzy/lib/plotjuggler/libParserROS1.so is a MessageParser plugin"
"/opt/ros/jazzy/lib/plotjuggler/libParserROS2.so is a MessageParser plugin"
"/opt/ros/jazzy/lib/plotjuggler/libProtobufParser.so is a MessageParser plugin"
"/opt/ros/jazzy/lib/plotjuggler/libPublisherCSV.so is a StatePublisher plugin"
"/opt/ros/jazzy/lib/plotjuggler/libToolboxFFT.so is a Toolbox plugin"
"/opt/ros/jazzy/lib/plotjuggler/libToolboxLuaEditor.so is a Toolbox plugin"
"/opt/ros/jazzy/lib/plotjuggler/libToolboxQuaternion.so is a Toolbox plugin"
Loading compatible plugins from directory:  "/home/christian/.local/share/PlotJuggler"
^C[ros2run]: Interrupt

The warning logging was initialized more than once may be relevant.

If I disable all plugins via --enabled_plugins " ", I am getting an additional log QBasicTimer::start: QBasicTimer can only be used with threads started with QThread at the end:

$ ros2 run plotjuggler plotjuggler --enabled_plugins " "
QSocketNotifier: Can only be used with threads started with QThread
Loading compatible plugins from directory:  "/opt/ros/jazzy/lib/plotjuggler_ros"
"/opt/ros/jazzy/lib/plotjuggler_ros/libDataLoadROS2.so is a DataLoader plugin"  ...skipping, because it is not explicitly enabled
"/opt/ros/jazzy/lib/plotjuggler_ros/libDataStreamROS2.so is a DataStreamer plugin"  ...skipping, because it is not explicitly enabled
[WARN] [1769036673.333371092] [rclcpp]: logging was initialized more than once
"/opt/ros/jazzy/lib/plotjuggler_ros/libTopicPublisherROS2.so is a StatePublisher plugin"  ...skipping, because it is not explicitly enabled
Loading compatible plugins from directory:  "/opt/ros/jazzy/lib/plotjuggler"
"/opt/ros/jazzy/lib/plotjuggler/libDataLoadCSV.so is a DataLoader plugin"  ...skipping, because it is not explicitly enabled
"/opt/ros/jazzy/lib/plotjuggler/libDataLoadMCAP.so is a DataLoader plugin"  ...skipping, because it is not explicitly enabled
"/opt/ros/jazzy/lib/plotjuggler/libDataLoadULog.so is a DataLoader plugin"  ...skipping, because it is not explicitly enabled
"/opt/ros/jazzy/lib/plotjuggler/libDataStreamSample.so is a DataStreamer plugin"  ...skipping, because it is not explicitly enabled
"/opt/ros/jazzy/lib/plotjuggler/libDataStreamUDP.so is a DataStreamer plugin"  ...skipping, because it is not explicitly enabled
"/opt/ros/jazzy/lib/plotjuggler/libDataStreamWebSocket.so is a DataStreamer plugin"  ...skipping, because it is not explicitly enabled
"/opt/ros/jazzy/lib/plotjuggler/libDataStreamZMQ.so is a DataStreamer plugin"  ...skipping, because it is not explicitly enabled
"/opt/ros/jazzy/lib/plotjuggler/libParserDataTamer.so is a MessageParser plugin"  ...skipping, because it is not explicitly enabled
"/opt/ros/jazzy/lib/plotjuggler/libParserLineInflux.so is a MessageParser plugin"  ...skipping, because it is not explicitly enabled
"/opt/ros/jazzy/lib/plotjuggler/libParserROS1.so is a MessageParser plugin"  ...skipping, because it is not explicitly enabled
"/opt/ros/jazzy/lib/plotjuggler/libParserROS2.so is a MessageParser plugin"  ...skipping, because it is not explicitly enabled
"/opt/ros/jazzy/lib/plotjuggler/libProtobufParser.so is a MessageParser plugin"  ...skipping, because it is not explicitly enabled
"/opt/ros/jazzy/lib/plotjuggler/libPublisherCSV.so is a StatePublisher plugin"  ...skipping, because it is not explicitly enabled
"/opt/ros/jazzy/lib/plotjuggler/libToolboxFFT.so is a Toolbox plugin"  ...skipping, because it is not explicitly enabled
"/opt/ros/jazzy/lib/plotjuggler/libToolboxLuaEditor.so is a Toolbox plugin"  ...skipping, because it is not explicitly enabled
"/opt/ros/jazzy/lib/plotjuggler/libToolboxQuaternion.so is a Toolbox plugin"  ...skipping, because it is not explicitly enabled
Loading compatible plugins from directory:  "/home/christian/.local/share/PlotJuggler"
QBasicTimer::start: QBasicTimer can only be used with threads started with QThread
^C[ros2run]: Interrupt

Expected behavior
The process should exit and return control to the terminal.

System details

• OS: Ubuntu 24.04
• Platform: bloom package
• Version 3.13.2

Additional context
Add any other context about the problem here.