1822457 - [CTW] Use the cached focus instead of PDocAccessible::RestoreFocus

Status: NEW

(Core :: Disability Access APIs, task)

Description

[James Teh [:Jamie]]

When a pop-up such as a menu or select dropdown is dismissed, we use PDocAccessible::RestoreFocus to ask the content process to force a focus event. We don't need to do this now because we cache the focus for each remote document (DocAccessibleParent::mFocus/GetFocusedAcc). We should use that instead, as it avoids an IPC round trip and will likely be more reliable (avoids some race conditions).

To do this, we'll need to cache the caret rect, since Windows needs that when firing focus events.