vim: Non-current windows use wrong info after switching between split windows

[Lokaltog]

For some reason non-current windows use the info of the last window added(?) after switching between split windows. Reproducable by following these steps:

1. Open vim
2. Open a random file, e.g. your vimrc
3. Do a :vsplit
4. Open another file or a blank file with :enew
5. Switch to the other split window

The non-current window is now displaying all the information from the original buffer (the first random file), and not the correct information for the buffer that is present in that window.

This bug may be caused by the "randomization" of window numbers when switching between split numbers, and the looping through windows where the w:powerline window variable is set. I've tried connecting the window data with the buffer number (i.e. storing data in w:powerline[bufnr]) but with no luck.

[Lokaltog]

Could be resolved by tagging windows with an unique ID like described here: http://stackoverflow.com/questions/5215163/how-to-get-a-unique-identifier-for-a-window