performance(rendering): improve rendering performance (#1960)

* refactor(plugins): plugins now need to explicitly ask to be rendered

* performance(render): remove various needless renders

* performance(render): cache boundaries

* performance(render): adjust tests and cache cursor location/shape

* style(comment): remove outdated

* style(fmt): rustfmt

1 files changed, 5 insertions, 5 deletions

diff --git a/zellij-tile/src/lib.rs b/zellij-tile/src/lib.rs
index 00dc60a96..800b6d684 100644
--- a/zellij-tile/src/lib.rs
+++ b/zellij-tile/src/lib.rs
@@ -6,7 +6,9 @@ use zellij_utils::data::Event;
 #[allow(unused_variables)]
 pub trait ZellijPlugin {
     fn load(&mut self) {}
-    fn update(&mut self, event: Event) {}
+    fn update(&mut self, event: Event) -> bool {
+        false
+    } // return true if it should render
     fn render(&mut self, rows: usize, cols: usize) {}
 }
 
@@ -41,15 +43,13 @@ macro_rules! register_plugin {
         }
 
         #[no_mangle]
-        pub fn update() {
+        pub fn update() -> bool {
             let object = $crate::shim::object_from_stdin()
                 .context($crate::PLUGIN_MISMATCH)
                 .to_stdout()
                 .unwrap();
 
-            STATE.with(|state| {
-                state.borrow_mut().update(object);
-            });
+            STATE.with(|state| state.borrow_mut().update(object))
         }
 
         #[no_mangle]