….Link` (#711)

…729)

When dash is embedded into an iframe with a sandbox attribute that only has allow-scripts, cookie/localstorage access is disabled and dash-core-components fails to load. As such, we need to restrict our cookie/localstorage usage by disabling functionality.

This patch moves the disabled functionality to a place where it doesn't get autoloaded regardless of usage, allowing dash-core-components to load in very restricted iframes.

* Fix clearable bug for single-option dropdowns.

* Fix clearable bug for multi-option dropdowns.

* Update CHANGELOG.

* Return if selected option is nil and dropdown is not clearable.

* Use backspaceRemoves and deleteRemoves.

Co-authored-by: Marc-André Rivet <Marc-Andre-Rivet@users.noreply.github.com>

#743)

full propTypes for ControlledPlotlyGraph to avoid weird React warning

Fix string comparison for lint:black in package.json

…Traces

Enhancement: add property Graph.prependData to support Plotly.prependTraces

PersistenceTransforms for date in datePickerRange and datePickerSingle