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* style(comment): remove outdated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

72 files changed, 646 insertions, 747 deletions

diff --git a/zellij-server/src/output/mod.rs b/zellij-server/src/output/mod.rs
index f40c8514e..51a21f7b4 100644
--- a/zellij-server/src/output/mod.rs
+++ b/zellij-server/src/output/mod.rs
@@ -396,6 +396,12 @@ impl Output {
         }
         Ok(serialized_render_instructions)
     }
+    pub fn is_dirty(&self) -> bool {
+        !self.pre_vte_instructions.is_empty()
+            || !self.post_vte_instructions.is_empty()
+            || self.client_character_chunks.values().any(|c| !c.is_empty())
+            || self.sixel_chunks.values().any(|c| !c.is_empty())
+    }
 }
 
 // this struct represents the geometry of a group of floating panes
diff --git a/zellij-server/src/panes/grid.rs b/zellij-server/src/panes/grid.rs
index 0bc2b7671..b3ee85a44 100644
--- a/zellij-server/src/panes/grid.rs
+++ b/zellij-server/src/panes/grid.rs
@@ -1081,11 +1081,14 @@ impl Grid {
     pub fn reset_viewport(&mut self) {
         let max_lines_to_scroll = *SCROLL_BUFFER_SIZE.get().unwrap() * 2; // while not very elegant, this can prevent minor bugs from becoming showstoppers by sticking the whole app display in an endless loop
         let mut lines_scrolled = 0;
+        let should_clear_output_buffer = self.is_scrolled;
         while self.is_scrolled && lines_scrolled < max_lines_to_scroll {
             self.scroll_down_one_line();
             lines_scrolled += 1;
         }
-        self.output_buffer.update_all_lines();
+        if should_clear_output_buffer {
+            self.output_buffer.update_all_lines();
+        }
     }
     pub fn rotate_scroll_region_up(&mut self, count: usize) {
         if let Some((scroll_region_top, scroll_region_bottom)) = self
diff --git a/zellij-server/src/panes/tiled_panes/mod.rs b/zellij-server/src/panes/tiled_panes/mod.rs
index cc4e95e6d..96fd2f67d 100644
--- a/zellij-server/src/panes/tiled_panes/mod.rs
+++ b/zellij-server/src/panes/tiled_panes/mod.rs
@@ -65,6 +65,8 @@ pub struct TiledPanes {
     fullscreen_is_active: bool,
     os_api: Box<dyn ServerOsApi>,
     senders: ThreadSenders,
+    window_title: Option<String>,
+    client_id_to_boundaries: HashMap<ClientId, Boundaries>,
 }
 
 impl TiledPanes {
@@ -100,6 +102,8 @@ impl TiledPanes {
             fullscreen_is_active: false,
             os_api,
             senders,
+            window_title: None,
+            client_id_to_boundaries: HashMap::new(),
         }