chore: Fix several style lints (#17488)

It's not comprehensive enough to start linting on `style` group, but
hey, it's a start.

Release Notes:

- N/A

crates/channel/src/channel_buffer.rs

@@ -177,13 +177,10 @@ impl ChannelBuffer {
         match event {
             language::Event::Operation(operation) => {
                 if *ZED_ALWAYS_ACTIVE {
-                    match operation {
-                        language::Operation::UpdateSelections { selections, .. } => {
-                            if selections.is_empty() {
-                                return;
-                            }
+                    if let language::Operation::UpdateSelections { selections, .. } = operation {
+                        if selections.is_empty() {
+                            return;
                         }
-                        _ => {}
                     }
                 }
                 let operation = language::proto::serialize_operation(operation);

crates/channel/src/channel_chat.rs

@@ -61,9 +61,9 @@ pub enum ChannelMessageId {
     Pending(usize),
 }
 
-impl Into<Option<u64>> for ChannelMessageId {
-    fn into(self) -> Option<u64> {
-        match self {
+impl From<ChannelMessageId> for Option<u64> {
+    fn from(val: ChannelMessageId) -> Self {
+        match val {
             ChannelMessageId::Saved(id) => Some(id),
             ChannelMessageId::Pending(_) => None,
         }

crates/channel/src/channel_store.rs

@@ -249,15 +249,14 @@ impl ChannelStore {
     }
 
     pub fn initialize(&mut self) {
-        if !self.did_subscribe {
-            if self
+        if !self.did_subscribe
+            && self
                 .client
                 .send(proto::SubscribeToChannels {})
                 .log_err()
                 .is_some()
-            {
-                self.did_subscribe = true;
-            }
+        {
+            self.did_subscribe = true;
         }
     }
 
@@ -423,7 +422,7 @@ impl ChannelStore {
     ) {
         self.channel_states
             .entry(channel_id)
-            .or_insert_with(|| Default::default())
+            .or_default()
             .acknowledge_message_id(message_id);
         cx.notify();
     }
@@ -436,7 +435,7 @@ impl ChannelStore {
     ) {
         self.channel_states
             .entry(channel_id)
-            .or_insert_with(|| Default::default())
+            .or_default()
             .update_latest_message_id(message_id);
         cx.notify();
     }
@@ -450,7 +449,7 @@ impl ChannelStore {
     ) {
         self.channel_states
             .entry(channel_id)
-            .or_insert_with(|| Default::default())
+            .or_default()
             .acknowledge_notes_version(epoch, version);
         cx.notify()
     }
@@ -464,7 +463,7 @@ impl ChannelStore {
     ) {
         self.channel_states
             .entry(channel_id)
-            .or_insert_with(|| Default::default())
+            .or_default()
             .update_latest_notes_version(epoch, version);
         cx.notify()
     }
@@ -924,7 +923,7 @@ impl ChannelStore {
                 if let Some(role) = ChannelRole::from_i32(membership.role) {
                     this.channel_states
                         .entry(ChannelId(membership.channel_id))
-                        .or_insert_with(|| ChannelState::default())
+                        .or_default()
                         .set_role(role)
                 }
             }
@@ -1094,11 +1093,7 @@ impl ChannelStore {
                         id: ChannelId(channel.id),
                         visibility: channel.visibility(),
                         name: channel.name.into(),
-                        parent_path: channel
-                            .parent_path
-                            .into_iter()
-                            .map(|cid| ChannelId(cid))
-                            .collect(),
+                        parent_path: channel.parent_path.into_iter().map(ChannelId).collect(),
                     }),
                 ),
             }
@@ -1113,14 +1108,11 @@ impl ChannelStore {
 
         if channels_changed {
             if !payload.delete_channels.is_empty() {
-                let delete_channels: Vec<ChannelId> = payload
-                    .delete_channels
-                    .into_iter()
-                    .map(|cid| ChannelId(cid))
-                    .collect();
+                let delete_channels: Vec<ChannelId> =
+                    payload.delete_channels.into_iter().map(ChannelId).collect();
                 self.channel_index.delete_channels(&delete_channels);
                 self.channel_participants
-                    .retain(|channel_id, _| !delete_channels.contains(&channel_id));
+                    .retain(|channel_id, _| !delete_channels.contains(channel_id));
 
                 for channel_id in &delete_channels {
                     let channel_id = *channel_id;