I can't believe I haven't installed virtualenvwrapper before. I already had great completion in zsh, but workon's tab completion is perfect.
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Copilot doesn't offer a way of disabling completion inside comments. People have discovered a comical workaround: swearing in the comment! https://github.com/orgs/community/discussions/8062#discussioncomment-11902740
GIMP is huge tool that I certainly haven't mastered, but it's so useful to have around.
I used it this week to convert images from obscure formats to common ones. It's a great swiss army knife and runs everywhere.
One interesting design choice in Emacs that I haven't seen in other editors: reserved shortcuts.
An Emacs extension shouldn't use F5 through F12, or Ctrl-c LETTER. This lets users configure their own shortcuts. https://www.gnu.org/software/emacs/manual/html_node/emacs/Key-Bindings.html
Does it exist elsewhere? I miss it in VS Code, where e.g. all the Fn keys are already assigned.