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* bpwin.itb (BpWin::goto_bp): Handle multiple source windows.
* srctextwin.itb (SrcTextWin::get_file): New method.
(SrcTextWin::set_tag_to_stack): New method.
* srctextwin.ith (get_file): Declare.
* srcwin.ith (update_hook_init, window_list, pc_window): New
common variables.
(_choose_window, choose_and_update, is_fixed, get_file): Declare.
* srcwin.itb (SrcWin::_choose_window): New method.
(SrcWin::choose_and_update): Likewise.
(SrcWin::_update): Renamed from update. Now private. Added `loc'
argument.
(SrcWin::get_file): New method.
(SrcWin::is_fixed): Likewise.
(SrcWin::constructor): Only add update hook once. Append this
object to window list.
(SrcWin::destructor): Don't add update hook. Remove this object
from window list. Clear pc_window if necessary.
(SrcWin::get_top): New method.
(SrcWin::_set_tag_to_stack): New method.
(SrcWin::choose_and_display): New method.