Avoid opening in winfixbuf windows

[sarmong]

Is your feature request related to a problem? Please describe.
When telescope is opened from a window with winfixbuf, a file cannot be edited in that window.

Describe the solution you'd like
Check if a window that the file is going to be open in has winfixbuf then choose another window - previously selected by the user (if possible to determine).

[jamestrew]

Check if a window that the file is going to be open in has winfixbuf then choose another window - previously selected by the user (if possible to determine).

I think this would be kind of complicated.
Maybe a compromise would be just open the file in a new split. I think this is the behavior vim uses when trying to open something from a quickfix list but the current buffer has winfixbuf.

[sarmong]

This seems reasonable.

One potential problem though - is there a chance it will mess up window layout? Say you have regular buffer and nvim-tree opened. You open telescope from nvim-tree. Might telescope open split shifting nvim-tree from leftmost (or rightmost) edge to the center?