Dancing Debug layout Locals and expression

Dancing Debug layout Locals and expression.

Qt 5.5.1

1) horizontal scrolbars are dancing size of scroll control is increasing and decreasing every half second.

Actual for both: locals and expressions window.

2) Also there is a problem again with a Locals and Expressions window -

2.1 the items there are grey

2.1  while clicking focus are gone after approx. half second 

Screenshots are attached , you may see that scroll element size is changed , though I do nothing.