Comment 1 for bug 700670

Can you please attach print screen, how does redo/undo buttons looks in you case. I think the best would be if two picture are attached:
1. first picture: how does it look now in Pinta 0.4
2. second picture: move around icons in image as you think is correct and attach "correct order".

Above request may look strange to you, but I am not familiar with RTL systems, so I don't even know if this is RTL related problem or not.

I am using Pinta 0.5 and I see undo then redo button (from left to right). Can you install Pinta 0.5 on your system and check if this solved the problem:
sudo add-apt-repository ppa:moonlight-team/pinta
sudo apt-get update
sudo apt-get install pinta

Similar bug (not exactly the same) was also reported related to undu/redo Gnome HIG: https://bugs.launchpad.net/pinta/+bug/671467 and fixes will be available in 0.6 version (release is estimated in January or beginning of February).