Request: Create proper size window according to current window layout

[linjiX]

Issue template

Issue description

The core command to open CtrlSF window is:

'botright vertical'. winsize .'split'

Vim will create a window which width = winsize

If remove the winsize:

'botright vertical split'

Vim will create a window with a proper window size according to current window layout.

Could you add a flag to support this behavior?