Fix plots of array items

[ivanpauno]

Fixes #64.

I rewrote it completely to avoid rqt_py_common.message_helpers/rqt_py_common.topic_helpers.
Those modules should never have existed really, they provide badly maintained implementations of utilities that already exist in rosidl_runtime_py or rosidl_parser.

[ivanpauno]

This probably should target a new foxy-devel branch, as this is likely not backwards compatible with crystal.
I could try to check if this is backwards compatible with dashing, and in that case create a dashing-devel branch.

@mabelzhang @cottsay what do you think?

[ivanpauno]

Those modules should never have existed really, they provide badly maintained implementations of utilities that already exist in rosidl_runtime_py or rosidl_parser.

Actually rosidl_runtime_py wasn't available in foxy/dashing the methods were available in rosidl_generator_py at that time.
So we should start by targeting a new galactic-devel branch and then work on a backport for previous releases (which should be easy to do).

[jacobperron]

Actually rosidl_runtime_py wasn't available in foxy/dashing the methods were available in rosidl_generator_py at that time.

I think rosidl_runtime_py was added in Eloquent. Or do you mean the functions you're using aren't available until Galactic?

[mabelzhang]

New branch sounds fine to me, whichever distro you guys figure out is the right one.
If any of you want to do the release, that's fine. Otherwise I can do it too, just let me know which branch is getting released into which distro, and if we're doing any forward or back porting.
I haven't really touched the ROS 2 part of this repo too much yet.

[ivanpauno]

I think rosidl_runtime_py was added in Eloquent. Or do you mean the functions you're using aren't available until Galactic?

Oh thanks! I don't know what I checked before 😅 .

[ivanpauno]

This is targeting now a new foxy-devel branch, I have double checked that all rosidl_parsed and rosidl_runtime_py were already available there.

I will open a PRs to ros2/repos after merging this

[jacobperron]

Similar to ros-visualization/rqt_msg#11 (comment), we should also update the release and rosdistro repos as well.

[jacobperron]

LGTM, thanks for fixing this!

[ivanpauno]

Similar to ros-visualization/rqt_msg#11 (comment), we should also update the release and rosdistro repos as well.

ros2/ros2#1097, ros2/ros2#1098, ros/rosdistro#28490, ros/rosdistro#28491 should solve everything