Call TIOCSWINSZ only on grid change

Instead of calling TIOCSWINSZ for every pixel change it will now be called only on changes to the grid size. This should reduce screen refreshes.

This fixes #2177.

CHANGELOG.md

@@ -20,6 +20,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Subprocess spawning on macos
 - Unnecessary resize at startup
 - Text getting blurry after live-reloading shaders with padding active
+- Resize events are not send to the shell anymore if dimensions haven't changed
 
 ## Version 0.3.0
 

src/display.rs

@@ -388,6 +388,8 @@ impl Display {
             let height = psize.height as f32;
             let cell_width = self.size_info.cell_width;
             let cell_height = self.size_info.cell_height;
+            let previous_cols = self.size_info.cols();
+            let previous_lines = self.size_info.lines();
 
             self.size_info.width = width;
             self.size_info.height = height;
@@ -412,7 +414,10 @@ impl Display {
             if let Some(message) = terminal.message_buffer_mut().message() {
                 pty_size.height -= pty_size.cell_height * message.text(&size).len() as f32;
             }
-            pty_resize_handle.on_resize(&pty_size);
+
+            if previous_cols != size.cols() || previous_lines != size.lines()  {
+                pty_resize_handle.on_resize(&pty_size);
+            }
 
             self.window.resize(psize);
             self.renderer.resize(psize, self.size_info.padding_x, self.size_info.padding_y);