Fix SpecialFoldersScreen crash

[cketti]

This fixes a crash reported via Google Play.

Exception java.lang.NullPointerException:
  at app.k9mail.feature.account.setup.ui.specialfolders.SpecialFoldersContentKt$SpecialFoldersContent$1$1$1.invoke (SpecialFoldersContent.kt:53)
  at app.k9mail.feature.account.setup.ui.specialfolders.SpecialFoldersContentKt$SpecialFoldersContent$1$1$1.invoke (SpecialFoldersContent.kt:51)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:109)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at app.k9mail.core.ui.compose.designsystem.molecule.ContentLoadingErrorViewKt$ContentLoadingErrorView$1$1.invoke (ContentLoadingErrorView.kt:29)
  at app.k9mail.core.ui.compose.designsystem.molecule.ContentLoadingErrorViewKt$ContentLoadingErrorView$1$1.invoke (ContentLoadingErrorView.kt:25)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:139)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.animation.AnimatedContentKt$AnimatedContent$6$1$5.invoke (AnimatedContent.kt:803)
  at androidx.compose.animation.AnimatedContentKt$AnimatedContent$6$1$5.invoke (AnimatedContent.kt:792)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:118)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.animation.AnimatedVisibilityKt.AnimatedEnterExitImpl (AnimatedVisibility.kt:771)
  at androidx.compose.animation.AnimatedContentKt$AnimatedContent$6$1.invoke (AnimatedContent.kt:774)
  at androidx.compose.animation.AnimatedContentKt$AnimatedContent$6$1.invoke (AnimatedContent.kt:757)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:109)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.animation.AnimatedContentKt.AnimatedContent (AnimatedContent.kt:816)
  at androidx.compose.animation.AnimatedContentKt.AnimatedContent (AnimatedContent.kt:143)
  at app.k9mail.core.ui.compose.designsystem.molecule.ContentLoadingErrorViewKt.ContentLoadingErrorView (ContentLoadingErrorView.kt:22)
  at app.k9mail.feature.account.setup.ui.specialfolders.SpecialFoldersContentKt$SpecialFoldersContent$1.invoke (SpecialFoldersContent.kt:43)
  at app.k9mail.feature.account.setup.ui.specialfolders.SpecialFoldersContentKt$SpecialFoldersContent$1.invoke (SpecialFoldersContent.kt:37)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:109)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:35)
  at androidx.compose.runtime.RecomposeScopeImpl.compose (RecomposeScopeImpl.kt:192)
  at androidx.compose.runtime.ComposerImpl.recomposeToGroupEnd (Composer.kt:2825)
  at androidx.compose.runtime.ComposerImpl.skipToGroupEnd (Composer.kt:3139)
  at app.k9mail.core.ui.compose.designsystem.template.ResponsiveWidthContainerKt.ResponsiveWidthContainer (ResponsiveWidthContainer.kt:62)
  at app.k9mail.feature.account.setup.ui.specialfolders.SpecialFoldersContentKt.SpecialFoldersContent (SpecialFoldersContent.kt:32)
  at app.k9mail.feature.account.setup.ui.specialfolders.SpecialFoldersScreenKt$SpecialFoldersScreen$5.invoke (SpecialFoldersScreen.kt:51)
  at app.k9mail.feature.account.setup.ui.specialfolders.SpecialFoldersScreenKt$SpecialFoldersScreen$5.invoke (SpecialFoldersScreen.kt:50)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke (ComposableLambda.jvm.kt:118)
  at androidx.compose.runtime.internal.ComposableLambdaImpl$invoke$1.invoke (ComposableLambda.jvm.kt:130)
  at androidx.compose.runtime.internal.ComposableLambdaImpl$invoke$1.invoke (ComposableLambda.jvm.kt:129)
  at androidx.compose.runtime.RecomposeScopeImpl.compose (RecomposeScopeImpl.kt:192)
  at androidx.compose.runtime.ComposerImpl.recomposeToGroupEnd (Composer.kt:2825)
  at androidx.compose.runtime.ComposerImpl.skipCurrentGroup (Composer.kt:3116)
  at androidx.compose.runtime.ComposerImpl.doCompose (Composer.kt:3607)
  at androidx.compose.runtime.ComposerImpl.recompose$runtime_release (Composer.kt:3552)
  at androidx.compose.runtime.CompositionImpl.recompose (Composition.kt:948)
  at androidx.compose.runtime.Recomposer.performRecompose (Recomposer.kt:1206)
  at androidx.compose.runtime.Recomposer.access$setCloseCause$p (Recomposer.kt:132)
  at androidx.compose.runtime.Recomposer.access$performRecompose (Recomposer.kt:132)
  at androidx.compose.runtime.Recomposer$runRecomposeAndApplyChanges$2$1.invoke (Recomposer.kt:616)
  at androidx.compose.runtime.Recomposer$runRecomposeAndApplyChanges$2$1.invoke (Recomposer.kt:585)
  at androidx.compose.ui.platform.AndroidUiFrameClock$withFrameNanos$2$callback$1.doFrame (AndroidUiFrameClock.android.kt:41)
  at androidx.compose.ui.platform.AndroidUiDispatcher.performFrameDispatch (AndroidUiDispatcher.android.kt:109)
  at androidx.compose.ui.platform.AndroidUiDispatcher.access$setScheduledFrameDispatch$p (AndroidUiDispatcher.android.kt:41)
  at androidx.compose.ui.platform.AndroidUiDispatcher.access$performFrameDispatch (AndroidUiDispatcher.android.kt:41)
  at androidx.compose.ui.platform.AndroidUiDispatcher$dispatchCallback$1.doFrame (AndroidUiDispatcher.android.kt:69)
  at android.view.Choreographer$CallbackRecord.run (Choreographer.java:1592)
  at android.view.Choreographer$CallbackRecord.run (Choreographer.java:1603)
  at android.view.Choreographer.doCallbacks (Choreographer.java:1125)
  at android.view.Choreographer.doFrame (Choreographer.java:1026)
  at android.view.Choreographer$FrameDisplayEventReceiver.run (Choreographer.java:1567)
  at android.os.Handler.handleCallback (Handler.java:958)
  at android.os.Handler.dispatchMessage (Handler.java:99)
  at android.os.Looper.loopOnce (Looper.java:224)
  at android.os.Looper.loop (Looper.java:318)
  at android.app.ActivityThread.main (ActivityThread.java:8763)
  at java.lang.reflect.Method.invoke
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:561)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1013)

For more details, see #8500.

This supersedes #8500.

[wmontwe]

I think the last two commit could be combined

[cketti]

I removed the test because it's only really useful for verifying this API change fixes the crash. Afterwards it's more confusing than helpful.

I added some KDoc to ContentLoadingErrorView with instructions on how to properly use it and a warning about the dangers.

[wmontwe]

👍