[sushi/backport-scale-factor-window-size] mainWindow: Account for scale factor while estimating window size

[Felipe Borges <felipeborges src gnome org>]

commit 0ca5bbc0fa504195345183b38a76b0e8e5b4158d
Author: Felipe Borges <felipeborges gnome org>
Date:   Wed May 26 16:07:48 2021 +0200

    mainWindow: Account for scale factor while estimating window size
    
    Fixes #64

 src/ui/mainWindow.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/ui/mainWindow.js b/src/ui/mainWindow.js
index b4906e7..f8f5915 100644
--- a/src/ui/mainWindow.js
+++ b/src/ui/mainWindow.js
@@ -250,8 +250,8 @@ var MainWindow = GObject.registerClass(class MainWindow extends Gtk.ApplicationW
         // See https://gitlab.gnome.org/GNOME/gtk/issues/1828
         let versionCheck = Gtk.check_version(3, 24, 9);
         if (!versionCheck) {
-            scaleW = geometry.width / WINDOW_MAX_W_BASE;
-            scaleH = geometry.height / WINDOW_MAX_H_BASE;
+            scaleW = (geometry.width / WINDOW_MAX_W_BASE) / this.get_scale_factor ();
+            scaleH = (geometry.height / WINDOW_MAX_H_BASE) / this.get_scale_factor ();
         }
 
         return [Math.floor(scaleW * WINDOW_MAX_W),