[BUG] Dropdown className is not passed to HTML

pip list

dash (1.0.2)
dash-bootstrap-components (0.7.0)
dash-core-components (1.0.0)
dash-daq (0.1.7)
dash-html-components (1.0.0)
dash-renderer (1.0.0)
dash-table (4.0.2)

Describe the bug

Writing dcc.Dropdown(id='myDropdown', className='myClass', ...) does not work.

Expected behavior

The className should be passed to the generated HTML, specifically to the div with the specified id=myDropdown.

Actual behavior

The className does not appear anywhere in the generated HTML.

Example

import dash
import dash_core_components as dcc
import dash_html_components as html

app = dash.Dash()
app.layout = dcc.Dropdown(id='myDropdown', className='myClass')
app.run_server(debug=True)

Screenshots

[alexcjohnson]

The parent_className prop of Tabs is essentially an exact match for what we talked about here - true, some of them are different states of the same element, but this one is a constant on a different element

https://github.com/plotly/dash-core-components/blob/5ed92d7a506101ccd84cc19028fc10ad8e3a3aa0/src/components/Tabs.react.js#L253

[byronz]

@wbrgss let’s bring this on Friday’s meeting