fix MediaFilePicker on snap13.79 and added mapper

mapper/src/main/kotlin/me/eternal/purrfectsnap/mapper/ClassMapper.kt

@@ -40,6 +40,7 @@ class ClassMapper(
             COFObservableMapper(),
             FoldingLayoutMapper(),
             PlatformClientAttestationMapper(),
+            ChatMediaDrawerMapper(),
         )
     }
 

mapper/src/main/kotlin/me/eternal/purrfectsnap/mapper/impl/ChatMediaDrawerMapper.kt

@@ -0,0 +1,48 @@
+package me.eternal.purrfectsnap.mapper.impl
+
+import me.eternal.purrfectsnap.mapper.AbstractClassMapper
+import me.eternal.purrfectsnap.mapper.ext.getClassName
+import me.eternal.purrfectsnap.mapper.ext.getSuperClassName
+
+class ChatMediaDrawerMapper : AbstractClassMapper("ChatMediaDrawer") {
+    val chatMediaDrawerClass = classReference("chatMediaDrawerClass")
+    val actionHandlerClass = classReference("actionHandlerClass")
+    val sendItemsMethodName = string("sendItemsMethodName")
+    /** List element type for sendItems(List, List) second parameter — used when generic type is erased. */
+    val sendItemsListItemClass = classReference("sendItemsListItemClass")
+
+    init {
+        mapper {
+            val drawerClass = classes.firstOrNull { clazz ->
+                val name = clazz.getClassName()
+                val superName = clazz.getSuperClassName() ?: return@firstOrNull false
+                name.contains("ChatMediaDrawer") &&
+                    !name.contains("ActionHandler") &&
+                    superName.contains("ValdiGeneratedRootView")
+            } ?: return@mapper
+
+            val actionHandlerClazz = classes.firstOrNull { clazz ->
+                clazz.getClassName().contains("ChatMediaDrawerActionHandler")
+            } ?: return@mapper
+
+            val sendItemsMethod = actionHandlerClazz.methods.firstOrNull { method ->
+                method.name == "sendItems" && method.parameterTypes.size == 2
+            } ?: actionHandlerClazz.methods.firstOrNull { method ->
+                method.parameterTypes.size == 2 &&
+                    method.parameterTypes[0].startsWith("Ljava/util/") &&
+                    method.parameterTypes[1].startsWith("Ljava/util/")
+            } ?: return@mapper
+
+            chatMediaDrawerClass.set(drawerClass.getClassName().replace("/", "."))
+            actionHandlerClass.set(actionHandlerClazz.getClassName().replace("/", "."))
+            sendItemsMethodName.set(sendItemsMethod.name)
+
+            // Find the list item type (e.g. Azc) by structure: has _order and _item (Valdi schema)
+            val listItemClass = classes.firstOrNull { clazz ->
+                val fieldNames = clazz.fields.map { it.name }.toSet()
+                fieldNames.contains("_order") && fieldNames.contains("_item")
+            }
+            listItemClass?.let { sendItemsListItemClass.set(it.getClassName().replace("/", ".")) }
+        }
+    }
+}