GUI Feedback Popup windows opening in topleft corner is not ideal.

I am not really sure what the best alternative is, but I find when playing, popups opening in the topleft corner to be uncomfortable positioning.

For example, there might be multiple triggers that I need to select which one to put on the stack first, so a box opens in the topleft corner and asks me to select which trigger to put on the stack first. I move the box to a more comfortable location, select my first trigger - then the box is back in the topleft corner asking me to select the next trigger. (It is probably a new box. I haven't looked at the code to verify, but that would make sense.)

Similar things happen when needing to order blockers for damage distribution. The box opens in the topleft corner covering the opponents creatures and the opponents stats (health, cards, mana, etc), so I need to move it out of the way to get a good look at the battlefield before making my choices. And each time, the next box is back in the topleft corner.

Off the top of my head, top-right of the battlefield (ie just before the chatbox) would probably be a better default location, though still not ideal.

The issue does not name files or tests. Reproduce trigger-selection and blocker-ordering popups, then trace the GUI code that positions each new popup; done means the dialogs no longer repeatedly obscure the battlefield and use an agreed default location.

Written by the indexing model from the issue text.