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As a workaround this appears to work using the latest source (groovy-devel branch) of rqt, so this looks like a bug in the released packages as opposed to a problem with the tutorial. I added the following to my hydro workspace:

- git: {local-name: qt_gui_core, uri: 'git@github.com:ros-visualization/qt_gui_core.git'}
- git: {local-name: rqt, uri: 'git@github.com:ros-visualization/rqt.git'}
- git: {local-name: rqt_common_plugins, uri: 'git@github.com:ros-visualization/rqt_common_plugins.git'}

and a new plugin was found and ran.

As a workaround this appears to work using the latest rqt source (groovy-devel branch) of rqt, branch, which is also used to build the hydro packages), so this looks like a bug in the released packages as opposed to a problem with the tutorial. I added the following to my hydro workspace:

- git: {local-name: qt_gui_core, uri: 'git@github.com:ros-visualization/qt_gui_core.git'}
- git: {local-name: rqt, uri: 'git@github.com:ros-visualization/rqt.git'}
- git: {local-name: rqt_common_plugins, uri: 'git@github.com:ros-visualization/rqt_common_plugins.git'}

and a new plugin was found and ran.

As Appears to be a problem with rqt caching the locations of plugins in its config and not updating that info. A workaround that works for me is delete that cache and restart rqt:

$ rm ~/.config/ros.org/rqt_gui.ini
$ rqt

A 2nd workaround: this appears to work using the latest rqt source (groovy-devel branch, which is also used to build the hydro packages), so this looks like a bug in the released packages as opposed to a problem with the tutorial. I added the following to my hydro workspace:

- git: {local-name: qt_gui_core, uri: 'git@github.com:ros-visualization/qt_gui_core.git'}
- git: {local-name: rqt, uri: 'git@github.com:ros-visualization/rqt.git'}
- git: {local-name: rqt_common_plugins, uri: 'git@github.com:ros-visualization/rqt_common_plugins.git'}

and a new plugin was found and ran.