fix: ensure grid has tabbable elements after it becomes visible #8102
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Description
Fixes #8098
When the grid is initially hidden,
_headerFocusable
is set toundefined
since there is no first visible row.Added the call to
_resetKeyboardNavigation()
on appear and a test to ensure focus gets moved properly.This makes the grid Tab navigation work in
Popover
and manually attachedDialog
.Type of change