Adding _getRowComponents function

[hfazai]

Adding a function that retrieves the list of components produced by ComponentRenderer in given Grid row.

It's based on _getCellComponent but it retrives all cell components in a specific row.

[mvysny]

Could you please provide an use-case for this functionality? I'm not convinced of its usability and I have the following counter-reasons:

• A grid with all columns using ComponentRenderer is known not to perform well, and is considered an anti-pattern;
• The _getCellComponent() is mostly used to click buttons present in grid columns
• The _expectRow() should use toPrettyString() on ComponentRenderer columns, therefore you can assert on the String component representation using expectRow() in a much easier fashion.

[hfazai]

Hi @mvysny ,

I wasn't aware of the usage of the usage of expectRow() on ComponentRenderer columns.

In my grid, I used ComponentRenderer because I wanted to access the rendered component so that I can apply style on it using element.style API. I didn't use ClassNameGenerator because style values are dynamic (for example the background color is calculated in my kotlin code depending on several conditions).

But indeed this made the grid very slow with big amount of data. so I'm tninking to use ClassNameGenerator and try to enumerate almost all possible styling values.

I thought to provide this method in case it's usefull for someone but I think your reasons are valid so I'm gonna close this PR.