sysinst screen clear failures

Hi,

[ cc'ing dsl@ as he is probably the most knowledgeable person of  
sysinst ]

While installing NetBSD on a shark machine, I've found that sysinst  
fails to clear the screen on multiple situations.  (I doubt this is  
specific to shark though.)  One of this is as follows:

1. Select "Install NetBSD to hard disk"
2. Select "Yes"
3. Press enter.
4. Select "Full installation"

At this point, the screen displays the "layout" menu but below the  
introductory text (and overlapped with the menu itself), the text  
from the previous menu (distset) appears twice in the background.

If in 4. instead of choosing a "Full installation" I select a "Custom  
installation", the intermediate menu properly clears the screen and,  
when I get to the "layout" menu all is fine.  Also hitting Ctrl+L in  
the broken menus redraws the screen appropriately.

I've been able to fix this by adding a clear()/refresh() sequence  
just after the "process_menu(MENU_distset, NULL)" call in install.c.   
But that seems to be a very ugly hack.  Shouldn't either msg_display  
or process_menu take care of this?  In fact, I've been trying to  
understand how other menus are shown and they don't seem to do an  
explicit clear, yet they work just fine...

If I mentioned that his seems to be a hack is because other menus  
show the same annoying behavior.  I can describe which other  
situations I've found so far... but fixing them one by one is begging  
for further problems in other menus.

Any ideas?

Thanks,

-- 
Julio M. Merino Vidal <[email protected]>