Restrict initial cell based size scaling to macOS only

No way to check if it is the right thing to do on other platforms

kitty/config.py

@@ -529,6 +529,10 @@ def initial_window_size_func(opts, cached_values):
     h, h_unit = opts.initial_window_height
 
     def get_window_size(cell_width, cell_height, dpi_x, dpi_y, xscale, yscale):
+        if not is_macos:
+            # not sure if scaling is needed on non-macOS platforms, requires
+            # someone with requisite hardware to test.
+            xscale = yscale = 1
         if w_unit == 'cells':
             width = cell_width * w / xscale + (dpi_x / 72) * (opts.window_margin_width + opts.window_padding_width) + 1
         else: