fix(core): `DropdownContext` fix for Shadow DOM

[waterplea]

Close #9106

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Unchanged files (5)

Status | Path | Size | Limits :------------: | ------------ | :------------: | :------------: :white_check_mark: | demo/browser/main.(hash).js
| 288.18KB | +10% :white_check_mark: | demo/browser/vendor.(hash).js
| 247.12KB | +10% :white_check_mark: | demo/browser/runtime.(hash).js
| 42.67KB | +10% :white_check_mark: | demo/browser/styles.(hash).css
| 16.18KB | +10% :white_check_mark: | demo/browser/polyfills.(hash).js
| 11.18KB | +10%

Total files change +10B 0%

Unchanged groups (1)

Status | Path | Size | Limits :------------: | ------------ | :------------: | :------------: :white_check_mark: | demo/browser/*..js
| 7.13MB | -

Final result: :white_check_mark:

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