The default linux keymap has this definition:
{ "keys": "shift+insert"], "command": "paste", "args": {"clipboard": "selection"} },…is that right? The binding doesn’t seem to do anything under Linux here, nor can I find other instances of that argument being used with the paste command. Windows/OSX simply have this binding:
{ "keys": "shift+insert"], "command": "paste" },…which works fine 
.
It pastes from the selection buffer, following the tradition X11 pattern (e.g., as used by terminals).
That being said, I changed it back in 2195 to the standard CUA bindings, as that’s what most GTK applications do.
Ah, great! (and doh, I’m on nightly builds, so I’m stuck on 2194… shouldn’t nightly builds always be newer than dev builds…?)
Sssh! 
They almost always are, but occasionally I’ll slip a minor change directly into a dev or stable build.
I must be one of the few people in the world who wished GTK apps would use Ctrl+V to paste from Clipboard and Shift+Ins to paste from Primary, like terminals have always done.
Oh well, at least ST can be configured to do so. Thanks.