assertion description is forgotten after using extracting

[joel-costigliola]

Summary

After using extracting the assertion information (including the description) is forgotten as a new assertion is created to check the extracted values

Example

assertThat(fellowshipOfTheRing).as("check names") 
                               .extracting("name")  
                               .contains(sauron);   

(obviously) fails as expected but check names does not appear in the error message.

[fiery-phoenix]

It is not compatible with #918 (#955). Unless, parent assertion description is to be added before fields names.

[joel-costigliola]

@fiery-phoenix point taken, #918 is valuable, let's try to see if it is possible to combine this and #918 without confusing users.

[PascalSchumacher]

This was fixed in 09c084f and 7365f84