zulip

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aryanshridhar 5c2bafc6b0 dropdown_list_widget: Refactor dropdown_list_widget to constructor function.

This is a prep commit for adding the support of Multiselect
dropdown list widget by prototypal inheritance.

The following change actually revamps the dropdown list widget
into a constructor function, due to which the widget is now to
be initialized with the `new` keyword (which adds a property
to __proto__ object that links to the constructor function's
prototype object).

Example-
const foo = new DropdownListWidget({....});

Due to the above change, this commit also modifies the declaration
of dropdown_list_widget across all our instances.

2021-07-29 10:09:03 -07:00