feat(plugins): reload plugin at runtime (#2372)

* fix(plugins): proper error when wasm file does not exist

* reload working

* race condition handling

* refactor(plugins): start plugin

* refactor(plugins): plugin-loader

* refactor(plugins): load/reload plugin

* refactor(plugins): apply cached events

* fix(plugins): gittery loading

* chore(plugins): rename reload-plugin to start-or-reload-plugin

* chore(styling): small cleanups

* style(fmt): rustfmt

* style(fmt): cleanups

* style(fmt): cleanups

* test(e2e): update snapshots

* test(e2e): update snapshots

* chore(repo): comment plugin optimization because it doubles the CI time

2 files changed, 8 insertions, 2 deletions

diff --git a/zellij-server/src/panes/grid.rs b/zellij-server/src/panes/grid.rs
index b76d21ecb..6f44f6eb4 100644
--- a/zellij-server/src/panes/grid.rs
+++ b/zellij-server/src/panes/grid.rs
@@ -1254,7 +1254,7 @@ impl Grid {
             let new_row = Row::new(self.width).canonical();
             self.viewport.push(new_row);
         }
-        if self.cursor.y == self.height - 1 {
+        if self.cursor.y == self.height.saturating_sub(1) {
             if self.scroll_region.is_none() {
                 if self.alternate_screen_state.is_none() {
                     self.transfer_rows_to_lines_above(1);
@@ -1406,7 +1406,7 @@ impl Grid {
     }
     fn line_wrap(&mut self) {
         self.cursor.x = 0;
-        if self.cursor.y == self.height - 1 {
+        if self.cursor.y == self.height.saturating_sub(1) {
             if self.alternate_screen_state.is_none() {
                 self.transfer_rows_to_lines_above(1);
             } else {
diff --git a/zellij-server/src/panes/plugin_pane.rs b/zellij-server/src/panes/plugin_pane.rs
index 8a45c3c10..7915069c5 100644
--- a/zellij-server/src/panes/plugin_pane.rs
+++ b/zellij-server/src/panes/plugin_pane.rs
@@ -545,6 +545,12 @@ impl Pane for PluginPane {
             self.loading_indication.to_string().as_bytes().to_vec(),
         );
     }
+    fn start_loading_indication(&mut self, loading_indication: LoadingIndication) {
+        self.loading_indication.merge(loading_indication);
+        self.handle_plugin_bytes_for_all_clients(
+            self.loading_indication.to_string().as_bytes().to_vec(),
+        );
+    }
     fn progress_animation_offset(&mut self) {
         if self.loading_indication.ended {
             return;