Add ImapStoreConfig.isExpungeImmediately()

app/common/src/main/java/com/fsck/k9/backends/ImapBackendFactory.kt

@@ -2,6 +2,7 @@ package com.fsck.k9.backends
 
 import android.content.Context
 import com.fsck.k9.Account
+import com.fsck.k9.Account.Expunge
 import com.fsck.k9.backend.BackendFactory
 import com.fsck.k9.backend.api.Backend
 import com.fsck.k9.backend.imap.ImapBackend
@@ -74,6 +75,8 @@ class ImapBackendFactory(
 
             override fun isSubscribedFoldersOnly() = account.isSubscribedFoldersOnly
 
+            override fun isExpungeImmediately() = account.expungePolicy == Expunge.EXPUNGE_IMMEDIATELY
+
             override fun clientId() = ImapClientId(appName = clientIdAppName, appVersion = clientIdAppVersion)
         }
     }

mail/protocols/imap/src/main/java/com/fsck/k9/mail/store/imap/ImapFolderFetcher.kt

@@ -41,6 +41,7 @@ class ImapFolderFetcher internal constructor(
         val config = object : ImapStoreConfig {
             override val logLabel = "folder-fetcher"
             override fun isSubscribedFoldersOnly() = false
+            override fun isExpungeImmediately() = false
             override fun clientId() = ImapClientId(appName = clientIdAppName, appVersion = clientIdAppVersion)
         }
         val oAuth2TokenProvider = createOAuth2TokenProviderOrNull(authStateStorage)

mail/protocols/imap/src/main/java/com/fsck/k9/mail/store/imap/ImapServerSettingsValidator.kt

@@ -32,6 +32,7 @@ class ImapServerSettingsValidator(
         val config = object : ImapStoreConfig {
             override val logLabel = "check"
             override fun isSubscribedFoldersOnly() = false
+            override fun isExpungeImmediately() = false
             override fun clientId() = ImapClientId(appName = clientIdAppName, appVersion = clientIdAppVersion)
         }
         val oAuth2TokenProvider = createOAuth2TokenProviderOrNull(authStateStorage)

mail/protocols/imap/src/main/java/com/fsck/k9/mail/store/imap/ImapStoreConfig.kt

@@ -3,5 +3,6 @@ package com.fsck.k9.mail.store.imap
 interface ImapStoreConfig {
     val logLabel: String
     fun isSubscribedFoldersOnly(): Boolean
+    fun isExpungeImmediately(): Boolean
     fun clientId(): ImapClientId
 }

mail/protocols/imap/src/test/java/com/fsck/k9/mail/store/imap/RealImapStoreTest.kt

@@ -408,6 +408,7 @@ class RealImapStoreTest {
         return object : ImapStoreConfig {
             override val logLabel: String = "irrelevant"
             override fun isSubscribedFoldersOnly(): Boolean = isSubscribedFoldersOnly
+            override fun isExpungeImmediately(): Boolean = true
             override fun clientId(): ImapClientId = ImapClientId(appName = "irrelevant", appVersion = "irrelevant")
         }
     }