maliput_viewer: Can't select lanes

[francocipollone]

Context

It's been a while since I last used maliput_viewer, today I tried it on a focal system and I am not being able
to select lanes as before. There have been some PRs merged related to clicking and hovering so I wonder if it ended up
messing up with something.

EDITED:

I tried it on bionic: the lane is at least selected and then immediately it gets aborted

[francocipollone]

Installing ign-gui3 via rosdep you get:

• For bionic: 3.6
• For focal: 3.5.1

While if it is installed via apt you get the latest minor release which is 3.7.

In the visualizer we are using some mouse events that were introduced in 3.6 version and it was verified in bionic the correct behavior when those changes were implemented. These events are related to mouse events on the scene. That means that for Focal the clicking events aren't being captured correctly, therefore, lanes can't be selected.

I've created an issue in ignition: gazebosim/gz-gui#299

[francocipollone]

Installing ign-gui3 via rosdep you get:
For bionic: 3.6

A correction: ign-gui3 isn't available to be installed via rosdep in Bionic. In bionic we have to use apt. I mixed all the containers I've tried.

[francocipollone]

Closing as gazebosim/gz-gui#299 has been solved, ergo last version of ignition-gui3 is available via rosdep solving this issue.