Why fix 0-time operations only if they are forward

[gscattablack]

On Nov 12 2022, you fixed 0-time operations in Commit 667a85c, with the following code (src/model/operation.cpp):

Why don't you consider also backward operations? I mean, for DLVR's I'd need the same fix, but I can't access it since forward is false.

I am quite new to frepple, so I might be very wrong. Thank you so much for your patience.

[jdetaeye]

This is a very low level question.
Can you explain/provide the higher level need and requirement that brought you to this particular piece of code?
Ideally, a test case where the current behavior looks wrong to you.