How do I prevent a split window from being resized by Vim?

Explanation

When you have a specific window you want to keep at a fixed size — like a terminal, log viewer, or reference file — winfixheight and winfixwidth prevent Vim from resizing that window when other windows are opened, closed, or equalized.

How it works

• :set winfixheight — fixes the current window's height
• :set winfixwidth — fixes the current window's width
• The window won't change size when you use <C-w>= or open/close other splits
• You can still manually resize with <C-w>+, <C-w>-, etc.

Example

" Create a 10-line terminal at the bottom, keep it fixed
:botright 10split | terminal
:set winfixheight

" Now opening/closing other windows won't change this terminal's height

+---------------------------+
| Main editing window       |
| (resizes normally)        |
+---------------------------+
| Terminal (10 lines fixed) |  ← winfixheight
+---------------------------+

Tips

• Combine both: :set winfixheight winfixwidth for a completely fixed window
• Use :resize 10 | set winfixheight to set an exact size then lock it
• Useful for reference windows, log tails, or REPL terminals
• Reset with :set nowinfixheight