Statusline function quirks

Three related questions about statusline:

1. The help for 'stl' states that the statusline will be evaluated with·
each window (and buffer) set to the current window (and buffer). So, is·
it a bug in the following that the local settings of the current window·
are mirrored in all statusline entries? (Version info below¹)

" This isn't what I'm actually doing in my function
" It's just a reduced test case
fun! StatusLine()
let indent = '('.repeat('·', &l:sw).')'
let cole = &l:cole ? ' ['.&l:cole.']' : ''
return indent . cole
endf

let &stl = '%!StatusLine()'

2. Is there a way to access the 'actual_curbuf' variable from within a·
function called as part of 'stl'?

E.g.:
se stl=%!StatusLine()
fun! StatusLine()
" access actual_curbuf from here?
endf

3. Trying a non-function approach, should the following work (change the·
highlighting for non-current statuslines)?

let &stl = '%<%f%{bufnr("")==actual_curbuf?"":"%#Error#"}blahblahblah'

--·
Best,
Ben

¹: Version:
VIM - Vi IMproved 7.3 (2010 Aug 15)
Included patches: 1-202, 204-222, 224-322
Compiled by 'http://www.opensuse.org/'
Huge version without GUI. Features included (+) or not (-):
+arabic +autocmd -balloon_eval -browse ++builtin_terms +byte_offset +cindent +clientserver +clipboard +cmdline_compl +cmdline_hist +cmdline_info +comments +conceal +cryptv
+cscope +cursorbind +cursorshape +dialog_con +diff +digraphs -dnd -ebcdic +emacs_tags +eval +ex_extra +extra_search +farsi +file_in_path +find_in_path +float +folding
-footer +fork() +gettext -hangul_input +iconv +insert_expand +jumplist +keymap +langmap +libcall +linebreak +lispindent +listcmds +localmap -lua +menu +mksession
+modify_fname +mouse -mouseshape +mouse_dec +mouse_gpm -mouse_jsbterm +mouse_netterm -mouse_sysmouse +mouse_xterm +multi_byte +multi_lang -mzscheme +netbeans_intg
+path_extra +perl +persistent_undo +postscript +printer +profile +python -python3 +quickfix +reltime +rightleft +ruby +scrollbind +signs +smartindent +sniff +startuptime
+statusline -sun_workshop +syntax +tag_binary +tag_old_static -tag_any_white +tcl +terminfo +termresponse +textobjects +title -toolbar +user_commands +vertsplit
+virtualedit +visual +visualextra +viminfo +vreplace +wildignore +wildmenu +windows +writebackup +X11 +xfontset -xim +xsmp_interact +xterm_clipboard -xterm_save
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user exrc file: "$HOME/.exrc"
fall-back for $VIM: "/etc"
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