[navigation menu] Fix keepMounted content sizing#4817
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<NavigationMenu.Content keepMounted>could transition the size of the popup on open incorrectly + fail to transition the popup dimensions when hovering over nested inline submenus.Root cause
Kept-mounted content can stay in the DOM while inactive, so it must not keep or regain ownership of the shared content ref used for popup sizing.
Before: https://stackblitz.com/edit/dwjmyhms
After: https://stackblitz.com/edit/dwjmyhms-hwgbd7w8
<NavigationMenu.Portal keepMounted>was one workaround before. Though that has a bug with the arrow transitioning (separate issue to fix)Changes
hiddenchanges and defer the first nested-content opening measurement so the popup uses the final nested content size.