Hi,
I explained before but it went unnoticed. The selection happens on double click like in any other editor.
The regular PluggableTextMorph also tries to do it on a kind of a double click, only it is implemented as click-pause-click. So, if you click once, wait 5 minutes, and click again, it will select. This is not particularly useful.
So, Rubric selects on double click.
Now, as I mentioned before, there happens to be a random double click issue. I cannot reproduce it, but sometimes it happens. Also, when I save the image and load it back, the problem is gone. Please note that this issue is not related to Rubric, but to the double click event throughout the entire image. For example, if you see that double click does not work in Rubric, try to double click on the window title to maximize a window and you will see that it does not work.
Cheers,
Doru