one more thing , please do not consider this sentence....'but do not select 'locrotate' of cube'
Lots of people use Blender on laptops, on Linux without this bug, so its likely this is an error specific to your configuration.
Closed by commit rBb1e48ab4e483.
What happened to this patch?
A result seems to vary according to a form of color depth of the png file so that you say.
This just makes it so Alt+RMB selecting always selects the entire interior loop.