[DMN Designer] Placeholder doesn't fit a column

If user included a PMML model into a DMN diagram, then he has possibility to define PMML function invocation. Grid for such invocation contains placeholders saying that document and model needs to be specified. The issue is placeholders doesn't column width and thus are not readable. See the attached picture.

Acceptance test

• Function column width, resizeable
• Change Expression type to Function
• Change Function Type (FEEL / JAVA / PMML)
• Undo function column width resize
• Decision > Context > Function column width, resizeable
• BKM > Function column width, resizeable DROOLS-4165