Ladybird/AppKit: Listen for device pixel ratio changes

Author: https://github.com/bplaat
Commit: 0574c0e474
Pull-request: https://github.com/SerenityOS/serenity/pull/21171
Reviewed-by: https://github.com/ADKaster ✅

Ladybird/AppKit/UI/TabController.mm

@@ -472,6 +472,11 @@ enum class IsHistoryNavigation {
     }
 }
 
+- (void)windowDidChangeBackingProperties:(NSNotification*)notification
+{
+    [[[self tab] web_view] handleDevicePixelRatioChange];
+}
+
 - (BOOL)validateMenuItem:(NSMenuItem*)item
 {
     if ([item action] == @selector(toggleLineBoxBorders:)) {