NEdit

Oh, we've tried that ages ago. IIRC, the problem is the library code in
Motif registers a server-side grab with the wrong modifiers. Since it's
server-side, the event never comes in for us to filter it out. If you have
patch that works, we'll be all over it!

Well, using xev the modifiers are between 1 and 10 hex, but the primary
bit patterns for state are 0x (for button down) and 400x (for button
release). I don't know where this chunk of code is, but something like
this would implement the desired logic:

if ( event == BUTTON3) {
if(state & 0x400){ /* button 3 release action */ }
else { /* button 3 press action */ }
}

Of course this assumes that there is a place in the code now where "event"
and "state" are available in this form. Perhaps with the callbacks in
Motif this is an invalid assumption.

This is a pretty good observation. It's is a bug as old as time in the
original Motif. We had tried to work around it in the past, but the
workaround could cause the X server to hang (a grab without an ungrab) and
that was unacceptable. A better workaround would help.