mod(renderer/direct): buffer and flush screen output accordingly

src/render.zig

@@ -201,12 +201,33 @@ pub const Direct = struct {
     }
 
     pub fn flush(this: *@This()) !void {
-        var writer = terminal.writer();
-        for (0..this.size.y) |row| {
+        const stdout_file = std.fs.File.stdout();
+        var buffer: [4096]u8 = undefined;
+        var stdout_writer = stdout_file.writer(&buffer);
+        var writer = &stdout_writer.interface;
+        defer writer.flush() catch {};
+
+        row: for (0..this.size.y) |row| {
             for (0..this.size.x) |col| {
                 const idx = (row * this.size.x) + col;
                 const cvs = this.screen[idx];
-                try cvs.value(&writer);
+                // are we done for this row already?
+                if (col + 1 < this.size.x and meta.eql(cvs, .{})) {
+                    // check the remaining line
+                    var last_cell = true;
+                    for (col..this.size.x) |x| {
+                        if (!meta.eql(cvs, this.screen[(row * this.size.x) + x])) {
+                            last_cell = false;
+                            break;
+                        }
+                    }
+                    if (last_cell) {
+                        //std.log.debug("Found the last cell in row: {d} at column: {d}", .{row, col});
+                        _ = try writer.write("\n");
+                        continue :row;
+                    }
+                }
+                try cvs.value(writer);
                 if (cvs.style.cursor) return; // that's where the cursor should be left!
             }
         }