Attempt to fix SQLite crash in migration.

app/src/main/java/org/thoughtcrime/securesms/database/ThreadTable.kt

@@ -20,6 +20,7 @@ import org.signal.core.util.requireInt
 import org.signal.core.util.requireLong
 import org.signal.core.util.requireString
 import org.signal.core.util.select
+import org.signal.core.util.toSingleLine
 import org.signal.core.util.update
 import org.signal.core.util.withinTransaction
 import org.signal.libsignal.zkgroup.InvalidInputException
@@ -1639,10 +1640,6 @@ class ThreadTable(context: Context, databaseHelper: SignalDatabase) : DatabaseTa
     return Reader(cursor)
   }
 
-  private fun String.toSingleLine(): String {
-    return this.trimIndent().split("\n").joinToString(separator = " ")
-  }
-
   private fun ConversationFilter.toQuery(): String {
     return when (this) {
       ConversationFilter.OFF -> ""

app/src/main/java/org/thoughtcrime/securesms/database/helpers/migration/V166_ThreadAndMessageForeignKeys.kt

@@ -7,6 +7,7 @@ import org.signal.core.util.delete
 import org.signal.core.util.logging.Log
 import org.signal.core.util.readToList
 import org.signal.core.util.requireLong
+import org.signal.core.util.toSingleLine
 import org.signal.core.util.update
 
 /**
@@ -49,7 +50,7 @@ object V166_ThreadAndMessageForeignKeys : SignalDatabaseMigration {
         COUNT(*) AS thread_count 
       FROM thread 
       GROUP BY thread_recipient_id HAVING thread_count > 1
-    """.trimMargin()
+    """.toSingleLine()
     ).use { cursor ->
       while (cursor.moveToNext()) {
         val recipientId = cursor.requireLong("thread_recipient_id")

core-util/src/main/java/org/signal/core/util/StringExtensions.kt

@@ -21,3 +21,20 @@ fun String.asListContains(item: String): Boolean {
       .map { it.substring(0, it.length - 1) }
       .any { item.startsWith(it) }
 }
+
+/**
+ * Turns a multi-line string into a single-line string stripped of indentation, separated by spaces instead of newlines.
+ *
+ * e.g.
+ *
+ * a
+ *   b
+ * c
+ *
+ * turns into
+ *
+ * a b c
+ */
+fun String.toSingleLine(): String {
+  return this.trimIndent().split("\n").joinToString(separator = " ")
+}