fix(tags-dialog): crash on unicode tags

When deserializing, we called the wrong method
so there was an unknown byte as a prefix

This then failed the string -> JSON conversion

fixes 16476

Author: david-allison

AnkiDroid/src/main/java/com/ichi2/anki/dialogs/tags/TagsDialog.kt

@@ -31,7 +31,6 @@ import com.ichi2.anki.R
 import com.ichi2.anki.analytics.AnalyticsDialogFragment
 import com.ichi2.anki.model.CardStateFilter
 import com.ichi2.anki.snackbar.showSnackbar
-import com.ichi2.anki.utils.ext.convertToString
 import com.ichi2.annotations.NeedsTest
 import com.ichi2.utils.DisplayUtils.resizeWhenSoftInputShown
 import com.ichi2.utils.TagsUtil
@@ -415,13 +414,13 @@ class TagsFile(path: String) : File(path), Parcelable {
             // https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/formats.md
             val string = Json.encodeToString(data)
             Timber.d("persisting tags to disk, length: %d", string.length)
-            outputStream.writeBytes(string)
+            outputStream.writeUTF(string)
         }
     }
 
     fun getData() = DataInputStream(FileInputStream(this)).use { inputStream ->
         // PERF!!: This takes ~2 seconds with AnKing
-        Json.decodeFromString<TagsData>(inputStream.convertToString())
+        Json.decodeFromString<TagsData>(inputStream.readUTF())
     }
 
     override fun describeContents(): Int = 0

AnkiDroid/src/test/java/com/ichi2/anki/dialogs/tags/TagsDialogTest.kt

@@ -44,6 +44,7 @@ import org.junit.Test
 import org.junit.runner.RunWith
 import org.mockito.Mockito
 import org.mockito.kotlin.whenever
+import timber.log.Timber
 import java.util.concurrent.atomic.AtomicReference
 
 @RunWith(AndroidJUnit4::class)
@@ -636,6 +637,21 @@ class TagsDialogTest : RobolectricTest() {
         }
     }
 
+    @Test
+    fun `unicode tags can be serialized 16576`() {
+        val type = TagsDialog.DialogType.FILTER_BY_TAG
+        val allTags = listOf("02动作状态")
+
+        val args = TagsDialog(ParametersUtils.whatever())
+            .withTestArguments(type, emptyList(), allTags)
+            .arguments
+        val mockListener = Mockito.mock(TagsDialogListener::class.java)
+        val factory = TagsDialogFactory(mockListener)
+        val scenario = FragmentScenario.launch(TagsDialog::class.java, args, R.style.Theme_Light, factory)
+        scenario.moveToState(Lifecycle.State.STARTED)
+        scenario.onFragment { Timber.d("Dialog successfully opened") }
+    }
+
     // these are called 'withTestArguments' due to "extension is shadowed by a member" warnings
     // this is needed so we can pass in 'targetContext' for context.cacheDir
     private fun TagsDialog.withTestArguments(