[Ubuntu] IDE not displaying spaces, tabs and digits
- Dominant language
- Java
- Stars
- 14.6k
- Forks
- 7k
- PR merge metrics
- No merged PRs in 30d
Description
Installed Arduino IDE version **1.8.10** 64bit on Ubuntu 19.10. The software seems to be working fine but digits, spaces and tabs do not display when writing/pasting/opening code in the editor, which makes it completely unusable.
(I can delete tabs/spaces/digits and they display correctly when copy-pasting to a text file, so it's probably just a display problem).
Same issue with the console below as you can see in this screenshot:

Contributor guide
Research direction
Reproduce the display problem on Ubuntu 19.10 using Arduino IDE 1.8.10, checking both the code editor and the console. Trace the rendering path for spaces, tabs, and digits; done means those characters display correctly while typing, pasting, and opening code.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java, ubuntu
- Domain
- desktop, operating-systems
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100