Bug 193032 – TextFieldInputType::m_dataListDropdownIndicator needs proper lifecycle management

• Status: NEW
• Component: DOM

[zalan]

it is pretty much non-existent atm.

[Ahmad Saleem]

It seems to address this bit - I think - https://bugs.webkit.org/show_bug.cgi?id=209909

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Existing logic in `TextFieldInputType` is responsible for upholding this invariant -- when the list attribute
changes on an input field (e.g. when we parse the list attribute, or when it is set by JavaScript), we update
the inline display style of `m_dataListDropdownIndicator`, such that it is set to `display: none` only if there
is either no list attribute, or the list attribute is empty, or the list does not refer to a connected datalist
element. However, there is one scenario in which this invariant is violated. Consider the following:

1. An input field is created, and its list attribute is set to "foo". Importantly, it is not connected yet.
2. A datalist element with id "foo" is then created and then added to the document.
3. The input field created in (1) is then added to the document.

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Is something else needed here? Thanks!