Change: Add title to perspective rows

[quigleyj-mavenomics]

Very long column names (which you might get from a join) tend to be cut off in the column view. Currently there isn't a way to see what the full column name is, without adding it to a grid view and looking at the column header.

Example:

With this change, they will now display a browser-native tooltip on mouse hover. This is more a stopgap/workaround than a solution, but it's not disruptive.

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[YairMarcowMavenomics]

FYI, I concurrently e-mailed in the FINOS CCLA (covering Joe Quigley's contribution and perhaps more to come in the future!)

[maoo]

@finos-cla-bot[bot] check

[finos-admin]

The cla-bot has been summoned, and re-checked this pull request!

[texodus]

Thanks for the PR!

@quigleyj-mavenomics unfortunately we've encountered some disruption with this implementation - specifically, it is common to override the context menu ala in Jupyterlab, and the title hover floats over the DOM-implemented context menu.

I've just pushed #650 which makes the left panel resizable on drag - hopefully this addresses the issue for you. If not, I can merge this patch with the caveat that I'll need to make this optional (and disabled by default likely).

[quigleyj-mavenomics]

That works for us! Having the drag-resize should address our need a lot better, especially since we have one dataset in particular with quite a few long-named columns.

[texodus]

Groovy, I will have this disted in 0.3.2 tomorrow.

[zalmane]

I have a related question - is it possible to provide a column header or "pretty name" in addition to the column id? this may also help cope with long column names.