menuconfig: Add .config loading dialog

Automatically turn on show-all mode if the currently selected node
becomes invisible after loading the new configuration.

Show an are-you-sure dialog if there are unsaved changes.

A wart here is that there currently isn't a way to get 'errno' and
'strerror' from the IOError exception returned by load_config(). Hack
around it by opening the configuration file separately with open()
first, just to catch any obvious errors.

0 files changed, 0 insertions, 0 deletions