Tmux and dimmed colors in Terminal.app on MacOS

Atcold

question

On my Mac (10.11) Tmux doesn't display -ed colors dimcorrectly , which is causing trouble.

In the image below, the name of the author of the submission should be indicated with dim white. This works fine in Terminal.app but not in Tmux .

git lg1 comparison

Does anyone have any clues on how to debug this method?
I believe it has something to do with $TERMvariables, but I don't know where to start.

In Terminal.app $TERM will be set to xterm-256color.
In Tmux $TERM set to screen-256color.

on .tmux.confme set -g default-terminal "screen-256color". xterm-256colorIn Tmux , somehow conflicts with Vim 's background color , but doesn't change its dimbehavior.

More information

I've opened an issue on Tmux 's GitHub repository ; an answer has been provided, but I don't fully understand it.

It looks like Terminal.app has no dimdirectives, although it can be handled.
Tmux can't get the diminformation because it doesn't exist, so it can't display the font correctly.

Now I'm not sure why one works and the other doesn't.

Atcold

easy to repair

Add the following code to ~/.tmux.conf.

set -sa terminal-overrides ",*:dim=\\E[2m"

Tentative explanation

Application.app doesn't seem to have dima directive (see number 24).

Terminal 0: xterm-256color [references=1, flags=0x1]:
   1: acsc: (string) ``aaffggiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz{{||}}~~
   0: AX: (flag) true
   2: bel: (string) \007
...
  23: dch1: (string) \033[P
  24: dim: [missing]
  25: dl: (string) \033[%p1%dM

This is the output of a command run tmux showmsgs -Tinside Tmux .

On the other hand, Terminal.app is still "sending" dim(don't know how or why ) because it's working, as shown in the image above.

Adding the missing dimdirective ( magically ) solved the problem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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