Only set window title when changed

Setting the window title every frame was causing Windows Explorer to
show a consistent 4% CPU usage when testing under Windows 10. This
change brings it down to 0.2%.

1 files changed, 7 insertions, 1 deletions

diff --git a/src/window.rs b/src/window.rs
index af60ef8..1949387 100644
--- a/src/window.rs
+++ b/src/window.rs
@@ -16,6 +16,7 @@ pub struct Window {
     render_request: RenderRequest,
     previous_cursor_position: Option<Point>,
     previous_cursor_icon: CursorIcon,
+    previous_title: String,
 }
 
 impl Window {
@@ -57,6 +58,7 @@ impl Window {
             render_request: RenderRequest::REDRAW,
             previous_cursor_position: None,
             previous_cursor_icon: CursorIcon::Default,
+            previous_title: String::new(),
         }
     }
 
@@ -65,7 +67,11 @@ impl Window {
     }
 
     pub fn update_title(&mut self) {
-        self.window.set_title(&self.controller.title());
+        let title = self.controller.title();
+        if title != self.previous_title {
+            self.window.set_title(&title);
+            self.previous_title = title;
+        }
     }
 
     pub fn update_cursor_icon(&mut self) {