Delete unreachable default clauses.
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The Dart analyzer will soon be changed so that if the `default` clause of a `switch` statement is determined to be unreachable by the exhaustiveness checker, a new warning of type `unreachable_switch_default` will be issued. This parallels the behavior of the existing `unreachable_switch_case` warning, which is issued whenever a `case` clause of a `switch` statement is determined to be unreachable. For details see dart-lang/sdk#54575. This PR deletes unreachable `default` clauses from `photo_view` now, to avoid a spurious warning when the analyzer change lands.
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The Dart analyzer will soon be changed so that if the
defaultclause of aswitchstatement is determined to be unreachable by the exhaustiveness checker, a new warning of typeunreachable_switch_defaultwill be issued. This parallels the behavior of the existingunreachable_switch_casewarning, which is issued whenever acaseclause of aswitchstatement is determined to be unreachable. For details seedart-lang/sdk#54575.
This PR deletes unreachable
defaultclauses fromphoto_viewnow, to avoid a spurious warning when the analyzer change lands.