Request to backport some screen-update code

[Jean-Marc Lasgouttes]

Hello,

The following patches are a backport of the recent patch series which 
added the possibility of knowing which paragraph metrics have a computed 
position and then fixed situations where the assertion added in this 
first patch was triggered.

Adding a new way to assert does not sound good in a stable series, BUT

1/ the assertion is not active in release code (this is not a real crash)

2/ I propose to add 3 more patches which addressed the known assertions.

Moreover, compared to the patch in master where a bad position will be 
returned in release code as -10000, the backported code will return -1 
as it used to do.

The 3 additional patches are harmless IMO, since all they do is add 
checks, add update operations, or remove a SinglePar optimization hint.

Riki, would that be OK?

JMarc
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