Could somebody explain, what is the reason to use set mouse=a? People say that thus I will be able, for example, to resize split windows (:sp, :vsp) by dragging separators, but I already can do it if I simply start Vim in cmd.exe on Windows, even if I start Vim without any settings (cmd.exe, then vim -u NONE). So why may I need set mouse=a?
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If you run vim -Nu NONE in cmd.exe you have mouse=a and that is why you can change split sizes with your mouse. Try to set mouse= and resize a split, it wouldn't work.
On my linux box mouse is empty by default so I can't resize splits with a mouse.
Help topic :h 'mouse' tells exactly this:
'mouse' string (default "", "a" for GUI and Win32,
set to "a" or "nvi" in |defaults.vim|)
So the reason to set mouse=a is obvious... to be able to use mouse in vim.
