Removing active keyboard layout crashes session

[Lorenzo Farnetani]

TL;DR
If you have multiple keyboard layouts and go to Settings->Region and language and remove the active one, session crashes and you are prompted to enter your password again.

How to reproduce :
Very easy, add a keyboard layout (Settings->Region and language) by clicking the [+] button, pick your favorite and make it the active one (or by going to the top bar and clicking on it or by pressing Meta+Space), now make sure you did this correctly by typing some text with the new layout.
Once you are ready to crash your session get back to the settings, click on your active keyboard layout and click the [-] button to remove the layout, your computer will freeze for a few seconds (at least mine did) then the screen goes black and puts you on the session login page.
Instead it should simply switch you on the next available one or ask you to pick another one before removing it.
I have Ubuntu 17.10 on a Thinkpad, everything is up-to-date.

The bug itself isn't very important but could be frustrating if a user has unsaved work.

Thanks to all of you for your work, i don't miss Windows

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1744472/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Lorenzo Farnetani (florenzo)]

Added faulty package