Issue 76518

Currently, measurement lines snap to object lines/points, but remain unchanged 
when objects are subsequently moved. I would like the ability to assign 
measuring lines to objects, so if you move objects, the measurement is 
automatically updated. I see two strategies for this:
A) Measuring from object part to object part. In this case, for either end of 
the measurement, we need to identify the object and the measuring point on the 
object. (top, left, bottom, right, center, near edge, far edge)
B) Measuring from glue point to glue point. In this case, it would be useful 
to have measurement lines with the same behaviour as connection lines.

Caveats:
* This feature may be impossible to implement within the current open document 
standard. As far as I can see, the Open Document specification does not 
provide for assigning objects (and optionally, glue points) as targets of 
measurement lines. The connector object seems to have the necessary 
components, but there is no connector type with the "legs" associated with 
measurement lines.
* In the case of near/far edge, overlapping objects may give rise to 
undeterminable/ambiguous decision of measurement points. This pertains to A).
* Direction of measurement can be along a set angle (i.e. horizontal/vertical 
measurement, in most cases), or along the path from object to object. Which 
behaviour is desired (fixed measurement angle and adjustable "legs", or equal 
length legs and measurement angle adjusted automatically according to object 
placement), should be selectable on a per-measurement basis. This pertains to 
both A) and B).

I have not done a very thorough analysis with different object shapes and 
implications thereof, so additional caveats may exist. The B) alternative 
should be easier to implement, but somewhat less useful. This is near to CAD 
functionality, which the Open Doc. specification is perhaps not intended for.