renderer: don't update frame if renderer grid size != terminal size

src/renderer/Metal.zig

@@ -908,12 +908,14 @@ pub fn updateFrame(
         }
 
         // If our terminal screen size doesn't match our expected renderer
-        // size then we skip a frame. This can happen if we get resized
-        // before the terminal gets resized. The terminal resize event also
-        // wakes up the renderer so we'll get another chance to update frame
-        // data.
-        if (self.cells.size.rows < state.terminal.rows or
-            self.cells.size.columns < state.terminal.cols)
+        // size then we skip a frame. This can happen if the terminal state
+        // is resized between when the renderer mailbox is drained and when
+        // the state mutex is acquired inside this function.
+        //
+        // For some reason this doesn't seem to cause any significant issues
+        // with flickering while resizing. '\_('-')_/'
+        if (self.cells.size.rows != state.terminal.rows or
+            self.cells.size.columns != state.terminal.cols)
         {
             return;
         }

src/renderer/OpenGL.zig

@@ -739,6 +739,19 @@ pub fn updateFrame(
             self.foreground_color = bg;
         }
 
+        // If our terminal screen size doesn't match our expected renderer
+        // size then we skip a frame. This can happen if the terminal state
+        // is resized between when the renderer mailbox is drained and when
+        // the state mutex is acquired inside this function.
+        //
+        // For some reason this doesn't seem to cause any significant issues
+        // with flickering while resizing. '\_('-')_/'
+        if (self.grid_size.rows != state.terminal.rows or
+            self.grid_size.columns != state.terminal.cols)
+        {
+            return;
+        }
+
         // Get the viewport pin so that we can compare it to the current.
         const viewport_pin = state.terminal.screen.pages.pin(.{ .viewport = .{} }).?;
 

src/renderer/Thread.zig

@@ -522,6 +522,8 @@ fn renderCallback(
         t.flags.cursor_blink_visible,
     ) catch |err|
         log.warn("error rendering err={}", .{err});
+
+    // Draw
     t.drawFrame(false);
 
     return .disarm;