Modeler: Unable to read validation message if it's truncated

Cayenne version: 4.1.M2-SNAPSHOT.

Steps:
1.Open project in Cayenne Modeler 
2.Create new DataMaps
3.Press File=>Save

Actual result: there is a new pop-up window with some validation problems. When this window has small sizes, the text isn't displayed fully.

Expected result: the validation text is displayed fully regardless of the window's size.