From 88f5310317f766f273d2d4239494be162fffa5ce Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sat, 8 Feb 2025 09:12:36 +0530
Subject: [PATCH] When calculating body font size clear cache if
 window.devicePixelRatio changes

---
 src/pyj/read_book/view.pyj | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/pyj/read_book/view.pyj b/src/pyj/read_book/view.pyj
index a4ad375666..af331508dc 100644
--- a/src/pyj/read_book/view.pyj
+++ b/src/pyj/read_book/view.pyj
@@ -163,7 +163,9 @@ def show_controls_help():
 
 def body_font_size():
     ans = body_font_size.ans
-    if not ans:
+    dpr = body_font_size.dpr
+    if not ans or window.devicePixelRatio is not dpr:
+        body_font_size.dpr = window.devicePixelRatio
         q = window.getComputedStyle(document.body).fontSize
         if q and q.endsWith('px'):
             q = parseInt(q)