I'm facing this issue in the 2017.3 update of PyCharm and IntelliJ.
The terminal is not processing characters correctly. Some examples:
1. Multiple lines on single "enter":
2. Incorrect rendering of text while using autocomplete:
I've uploaded the idea.log file on https://uploads.services.jetbrains.com/ by the name: Terminal_displaying_characters_incorrectly_in_2017.3_update_idea.log
My terminal setup is zsh + prezto. Using OSX El Capitan v 10.11.6, let me know if any more details are required.
Found the same issue raised in these places, none of them have a solution: