Merge changes from origin/7.2

15e24ec Fix too wide Table columns while sorting from init (#13517)
a86798c Fix ScreenshotTB3Test removing reference images

Change-Id: Iec1c2caceb99a6c8cfad9a0911d4a9cd7a23db36

diff --cc client/src/com/vaadin/client/ui/VScrollTable.java
Simple merge

diff --cc client/src/com/vaadin/client/ui/table/TableConnector.java
Simple merge

diff --cc uitest/src/com/vaadin/tests/tb3/ScreenshotTB3Test.java
Simple merge