[Task]: Remove the need to call the PropsUi.setLook()

[hansva]

What needs to happen?

migration: https://issues.apache.org/jira/browse/HOP-3829

I'd like to remove the need to call the PropsUi.setLook() method when creating each widget.

I have a proposal for a new method PropsUi.setTheme() which is processes the whole widget tree. 

No need to use the setLook() method anymore in action and transform plugins, except when dynamically adding widgets during execution (tab In/out for webservice). 

Issue Priority

Priority: 3

Issue Component

Component: API

[mattcasters]

@nadment it's a good idea. Move all the calls to BaseDialog.defaultShellHandling(), like you said.

[nadment]

In reality, there are very few places where you need to implement a theme adjustment if the method manages the entire widget hierarchy.

[mattcasters]

Close it then :-)

[nadment]

I gave it a try, and my Hop looks great with just 9 calls to PropsUi.setTheme, making the PropsUi.setLook functions unnecessary.