fix(frontend): focustrapがzindexを考慮するように #14431
Merged
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What
単に呼ばれた順にfocustrapをはめるのではなく、もしそれより上に表示されている要素があれば一番手前のものにfocustrapをかけて、その一番手前のものに対するfocustrapが解除されたらその次に手前にいたものにfocustrapを切り替える…というふうにした
Why
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