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Couldn't find anything in autocommand-events, but is there may be a way to be notified if window split size was changed (with mouse or with C-w +)?
What I try to achieve is to be able to auto-save the window layout if size was changed.
PS: that is for my WIP plugin https://github.com/habamax/vim-winlayout which is heavily inspired by and uses code from @dedowsdi answer
One undocumented trick is to use %{MyFunc()} expression in the statusline syntax. MyFunc() is always called whenever something happens so you can check the window size in it.
For example, You can see the window height/width in the statusline.
function! EchoWinSize()
return winheight(0) . '/' . winwidth(0)
endfunction
let &statusline = "%{EchoWinSize()}"
As well as the statusline, guitablabel, iconstring, rulerformat, tabline, titlestring options support the statusline syntax.
However, I am not sure about its negative side effect.
I found this trick since I have been looking for something like a WindowScrolled event, but not yet implemented. In my plugin, I am thinking to use iconstring, which seems not to be used so common, to check the window scroll.
