Hi, there are several things at play here as far as I was able to find out.
I was researching this issue when I was frustrated with pasting from Chrome and was able to figure at out at least a temporarily solution. Here's my original post http://forum.world.st/Re-Copy-past-doesn-t-work-sometimes-in-Chrome-semifixed-td4784604.html I also opened an issue today, however I'm not familiar with VM so I cannot conclusively say what is correct. https://pharo.fogbugz.com/f/cases/14759/Linux-X11-VM-default-encoding-should-be-unicode As far as middle mouse pasting goes there are two sides of it: 1. Does Pharo VM (C-side) support it? 2. Does Pharo (Smalltalk-side) support it? I believe the answer to the first one is yes, the code does make mentions of primary selection, however the code is quite complex for me (my investigation was pretty much trial & error)... https://github.com/pharo-project/pharo-vm/blob/master/platforms/unix/vm-display-X11/sqUnixX11.c However the answer to second one is probably not, at least I was not able to find any bindings between middle mouse button and pasting - but again, I'm not familiar with Pharo internals. I could open an issue for this also, however considering the code is quite old (years) and nobody fixed it yet, nobody seems to be really bothered by it. I for example prefer ctrl+c clipboard selection over middle mouse primary selection, but if you have the knowledge to fix this (which I don't have), then feel free. :) Peter