fix(material/sidenav): mark content as inert while open#33247
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Fixes that a content query for `MatDrawerContent` wasn't resolving `MatSidenavContent` in the sidenav container.
Even though we trap focus within the sidenav, it's still possible for users' focus to escape and go into the content that's hidden behind it. These changes mark the content as `inert` while a sidenav is open. Fixes angular#32805.
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…33257) In #33247 I added some logic to mark the drawer content as `inert` while it's closed. That logic is too brittle and it seems to fail to reset the attribute if the user calls `close` from the `backdropClick` callback. These changes switch to a more robust approach where we have have the reset logic in a single place and we always execute it, rather than trying to do it right when focus is moved in/out of the sidenav.
crisbeto
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May 14, 2026
…33257) In #33247 I added some logic to mark the drawer content as `inert` while it's closed. That logic is too brittle and it seems to fail to reset the attribute if the user calls `close` from the `backdropClick` callback. These changes switch to a more robust approach where we have have the reset logic in a single place and we always execute it, rather than trying to do it right when focus is moved in/out of the sidenav. (cherry picked from commit a4e2b32)
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Even though we trap focus within the sidenav, it's still possible for users' focus to escape and go into the content that's hidden behind it.
These changes mark the content as
inertwhile a sidenav is open.Also fixes one issue I found along the way which prevented queries from resolving the sidenav content.
Fixes #32805.