renderer: message uses new size struct

src/renderer/Thread.zig

@@ -371,9 +371,10 @@ fn drainMailbox(self: *Thread) !void {
                 self.renderer.markDirty();
             },
 
-            .resize => |v| {
-                try self.renderer.setScreenSize(v.screen_size, v.padding);
-            },
+            .resize => |v| try self.renderer.setScreenSize(
+                v.screen,
+                v.padding,
+            ),
 
             .change_config => |config| {
                 defer config.alloc.destroy(config.thread);

src/renderer/message.zig

@@ -54,14 +54,8 @@ pub const Message = union(enum) {
     /// config file in response to an OSC 12 command.
     cursor_color: ?terminal.color.RGB,
 
-    /// Changes the screen size.
-    resize: struct {
-        /// The full screen (drawable) size. This does NOT include padding.
-        screen_size: renderer.ScreenSize,
-
-        /// The explicit padding values.
-        padding: renderer.Padding,
-    },
+    /// Changes the size. The screen size might change, padding, grid, etc.
+    resize: renderer.Size,
 
     /// The derived configuration to update the renderer with.
     change_config: struct {

src/termio/Termio.zig

@@ -382,12 +382,7 @@ pub fn resize(
     }
 
     // Mail the renderer so that it can update the GPU and re-render
-    _ = self.renderer_mailbox.push(.{
-        .resize = .{
-            .screen_size = size.screen,
-            .padding = size.padding,
-        },
-    }, .{ .forever = {} });
+    _ = self.renderer_mailbox.push(.{ .resize = size }, .{ .forever = {} });
     self.renderer_wakeup.notify() catch {};
 }