screen: Only switch layouts if the window has been majorly resized (#913)

* screen: Only switch layouts if the window has been majorly resized

Changing the layout can cause the window to resize on some systems.
This can create a feedback loop on systems with square displays.

Keep track of the vertical aspect ratio associated with the current
mode and only switch between vertical and horizontal mode when a
significant aspect ratio change has been detected.

* fixup

---------

Co-authored-by: alfrix <alfredomonclus@gmail.com>

screen.py

@@ -122,7 +122,8 @@ class KlipperScreen(Gtk.Window):
         self.set_resizable(True)
         if not (self._config.get_main_config().get("width") or self._config.get_main_config().get("height")):
             self.fullscreen()
-        self.vertical_mode = self.width < self.height
+        self.aspect_ratio = self.width / self.height
+        self.vertical_mode = self.aspect_ratio < 1.0
         logging.info(f"Screen resolution: {self.width}x{self.height}")
         self.theme = self._config.get_main_config().get('theme')
         self.show_cursor = self._config.get_main_config().getboolean("show_cursor", fallback=False)
@@ -962,9 +963,13 @@ class KlipperScreen(Gtk.Window):
 
     def update_size(self, *args):
         self.width, self.height = self.get_size()
-        if self.vertical_mode != (self.width < self.height):
+        new_ratio = self.width / self.height
+        new_mode = new_ratio < 1.0
+        ratio_delta = abs(self.aspect_ratio - new_ratio)
+        if ratio_delta > 0.1 and self.vertical_mode != new_mode:
             self.reload_panels()
-            self.vertical_mode = self.width < self.height
+            self.vertical_mode = new_mode
+            self.aspect_ratio = new_ratio
 
 
 def main():