config: allow disabling explicit-sync

jay-config/src/_private/client.rs

@@ -810,6 +810,10 @@ impl Client {
         self.send(&ClientMessage::SetIdle { timeout })
     }
 
+    pub fn set_explicit_sync_enabled(&self, enabled: bool) {
+        self.send(&ClientMessage::SetExplicitSyncEnabled { enabled })
+    }
+
     pub fn set_seat(&self, device: InputDevice, seat: Seat) {
         self.send(&ClientMessage::SetSeat { device, seat })
     }

jay-config/src/_private/ipc.rs

@@ -428,6 +428,9 @@ pub enum ClientMessage<'a> {
         workspace: WorkspaceSource,
         connector: Connector,
     },
+    SetExplicitSyncEnabled {
+        enabled: bool,
+    },
 }
 
 #[derive(Serialize, Deserialize, Debug)]

jay-config/src/lib.rs

@@ -222,3 +222,12 @@ pub fn workspaces() -> Vec<Workspace> {
 pub fn set_idle(timeout: Option<Duration>) {
     get!().set_idle(timeout.unwrap_or_default())
 }
+
+/// Enables or disables explicit sync.
+///
+/// Calling this after the compositor has started has no effect.
+///
+/// The default is `true`.
+pub fn set_explicit_sync_enabled(enabled: bool) {
+    get!().set_explicit_sync_enabled(enabled);
+}