@Nickog13 any analysis or PR would be great. I have a feeling the issue is somewhere merging the PassThrough props with the row props.

I think the issue is, the row props are not applied to the rows in components like datatable\TableFooter, datatable\TableHeader and the corresponding treetable components. For example in TableFooter.js there is createContent with that (in rows.map()):

const rootProps = mergeProps(
    {
        role: 'row'
    },
    getRowPTOptions(row, 'root')
);

Are the style and className property supposed to be included in getRowPTOptions(row, 'root')? I was able to fix it and include the className by using the RowBase.getProps() just like it is done in row\Row.js but I am unsure whether this is the correct way to fix it or to adjust getRowPTOptions:

const rowProps = RowBase.getProps(row.props, context);
const rootProps = mergeProps(
    {
        role: 'row'
    },
    rowProps,
    getRowPTOptions(row, 'root')
);

Also I am not sure at which points I need to fix this additionally, I guess TableFooter.js, TableHeader.js, TreeTableFooter.js, TreeTableHeader.js, but I am not sure if there are other components, at which needs to be fixed as well.

Hmm the getRowPTOptions should already have the rowProps. Maybe that is where the issue is?

I have opened a PR with currently adding the RowBase.getProps() (have not seen your comment unfortunately). If getRowPTOptions should include it already, I can check further where the style and className are lost.

By the way, I needed to adjust a few ts interfaces by adding onToggle to Omit due to getting a build error (mentioned it in the PR). Is this currently present in the master code base? Error looks like this: "Type 'ToggleEvent is missing the following properties from type 'FieldSetToggleEvent': originalEvent, value". Just added it to Omit for now to be able to build it

I think something is lost in ComponentBase getPTValue().
getRowPTOptions calls ptm() & ptmo() on the rProps which then both call getPTValue but this returns an undefined value.

I am not sure which part inside of the getPTValue() should contain the corresponding props, I see in the final return of the function that mergeSections is true and useMergeProps is false, so this line is used for the return:

: { ...globalPT, ...self, ...(Object.keys(datasetProps).length ? datasetProps : {}) }

with globalPT and self being undefined again.

Should self contain the rowProps or another variable? And should the row properties be returned in the ptm() or the ptmo() call?