refactor(widget): Allow state events to be converted to filter inputs

So that when I need to do this (in later commits) I don't have to cast.

Author: robintown

crates/matrix-sdk/src/widget/filter.rs

@@ -14,7 +14,8 @@
 
 use ruma::{
     events::{
-        AnyTimelineEvent, AnyToDeviceEvent, MessageLikeEventType, StateEventType, ToDeviceEventType,
+        AnyStateEvent, AnyTimelineEvent, AnyToDeviceEvent, MessageLikeEventType, StateEventType,
+        ToDeviceEventType,
     },
     serde::Raw,
 };
@@ -224,6 +225,16 @@ impl<'a> TryFrom<&'a Raw<AnyTimelineEvent>> for FilterInput<'a> {
     }
 }
 
+/// Create a filter input based on [`AnyStateEvent`].
+/// This will create a [`FilterInput::State`].
+impl<'a> TryFrom<&'a Raw<AnyStateEvent>> for FilterInput<'a> {
+    type Error = serde_json::Error;
+
+    fn try_from(raw_event: &'a Raw<AnyStateEvent>) -> Result<Self, Self::Error> {
+        raw_event.deserialize_as()
+    }
+}
+
 #[derive(Debug, Deserialize)]
 pub struct FilterInputToDevice<'a> {
     #[serde(rename = "type")]