From 786f8c7b1f39f532483b552bd6ac85f8b5b62beb Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Fri, 22 Jan 2021 20:22:09 +0530
Subject: [PATCH] macOS: Ensure font size is correct if the OS moves the newly
 created window to a different monitor after it is shown

---
 kitty/glfw.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/kitty/glfw.c b/kitty/glfw.c
index 2dce3191a..3051de013 100644
--- a/kitty/glfw.c
+++ b/kitty/glfw.c
@@ -625,6 +625,16 @@ create_os_window(PyObject UNUSED *self, PyObject *args) {
         Py_DECREF(pret);
         if (x != -1 && y != -1) glfwSetWindowPos(glfw_window, x, y);
         glfwShowWindow(glfw_window);
+#ifdef __APPLE__
+        float n_xscale, n_yscale;
+        double n_xdpi, n_ydpi;
+        get_window_content_scale(glfw_window, &n_xscale, &n_yscale, &n_xdpi, &n_ydpi);
+        if (n_xdpi != xdpi || n_ydpi != ydpi) {
+            // this can happen if the window is moved by the OS to a different monitor when shown
+            xdpi = n_xdpi; y_dpi = n_ydpi;
+            fonts_data = load_fonts_data(global_state.font_sz_in_pts, xdpi, ydpi);
+        }
+#endif
     }
     if (is_first_window) {
         PyObject *ret = PyObject_CallFunction(load_programs, "O", is_semi_transparent ? Py_True : Py_False);