Make panes resize when host window is resized

Question

I like to use vimdiff as a git diff/merge tool. The problem is when I resize the host terminal window to a new size: of the two split panes, the leftmost remain of the same width, while the rightmost is extended to full window size.

Is there a command to make the split panes equal width after the windows has been resized? Or a setting that makes the panes always be of same size? I looked into :set equalalways but it does not seem to do what I am asking.

Answer 1

To go along with @janos's answer, you can set an autocmd to automatically press those keys when the window is resized (put this in your .vimrc without the leading colon if you want it to apply every time you open Vim):

:autocmd VimResized * wincmd =

Here are the docs for the VimResized autocmd.

Answer 2

Ctrlw= will resize the split panes to become equal. But I don't know how to make them equal automatically, triggered when the window is resized.