Vertical tmux borders dashed only when using iTerm

Question

At my new job I'll need to use a mac, and I'm trying to use tmux with iTerm version 2.

While horizontal borders appear to be displayed with the proper ACS box-drawing characters[1], the vertical borders are dashed. This is not a problem in Terminal.app, the borders are displayed correctly. The problem appears to occur regardless of the font I select.

In all the screen shots I can find of iTerm and tmux this seems to be the case as well. Is this simply a limitation of iTerm, or is there a problem with my terminfo or locale?

[1] Tmux borders displayed as x q instead of lines?

Answer 1

Old post but anyway for people looking into this still. I find it best to set a different font for Non-Ascii characters and my actual font used for ASCII characters.

For reference I use Menlo for Powerline for Non-ASCII and Droid Sans Mono for my ASCII font and this sorts out the vertical line spacing without faffing around with vertical spacing etc.

Answer 2

The gap you see between the vertical bar characters is a combined effect the current font's design and vertical spacing. For me, I saw a marked decrease in the gaps when I switched to Courier New, but I also don't observe a difference between iTerm2 and Terminal for the same font. Decreasing the vertical spacing from the font selector can help, but may also crowd the lines together too much.

Answer 3

In iTerm2 I was able to get things looking near-perfect by using a larger font for non-ascii characters:

Settings: