I moved mvim to /usr/local/bin, so from Terminal if I type mvim file.html, then MacVim will open in a new window and open the file file.html.
But if I open another file from Terminal, then it will open another MacVim window.
Is it possible open the new file as a new tab on MacVim?
I currently have the MacVim setting as
Open files from application: in the current window
with a tab for each file
But that only open new files in a new tab only if I open the file from MacVim (not running mvim from the Terminal).
This hack should work, but it may be frustrating to maintain every time that MacVim is updated. It requires you to edit the mvim script. This seems to be a longstanding and known issue.