[2.0.28] Off-by-one display issue in research queue

[tux3]

This is a small display bug in the research window, when the last level of a research is already queued, and is selected again in the list of techs, the infocard still tries to display the number for the next level, which doesn't exist.

This always reproduces, with steps:
- Open the tech tree/research queue screen
- Click a tech in the List of technologies that has multiple levels, is not an infinite research line, and where only the last level not researched. For instance, click Braking Force 7
- In the infoview above the List of tech, Braking force 7 appears, with the costs, the effects, and a little number 7 below the picture on the info card
- Queue Braking force 7
- Click Braking force 7 in the research queue (at the top), the infocard switches to a different focus, but displays Braking force 7 again, correctly
- Now click Braking force again in the List of tech (at the bottom), the infocard will try to display the number for the next level under the picture, here the number 8 appears
- There is no braking force 8, it is a finite research line that stops at 7!

The infocard does prevent me from queueing level 8 ("All levels for this tech are already researched or queued"), it should also check not to increment the number displayed when the last level is already queued.

Screenshot:

snap-1332.jpg (346.91 KiB) Viewed 500 times

I can't find an existing report for this small nitpick, and apologies if I missed anything =)

Cheers!

[Rseding91]

Thanks for the report. This is now fixed for the next release.