master ef1dfd2261: Fix blurry text on multiple scale monitor setups

[Po Lu]

branch: master
commit ef1dfd2261f717136896b73dc96e7c3fbd72c14d
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Fix blurry text on multiple scale monitor setups
    
    * src/pgtkterm.c (pgtk_copy_bits): Preserve window scale factor
    on temporary surface.  (bug#54040)
---
 src/pgtkterm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/pgtkterm.c b/src/pgtkterm.c
index 65408801cf..54b65ac54e 100644
--- a/src/pgtkterm.c
+++ b/src/pgtkterm.c
@@ -2927,6 +2927,7 @@ pgtk_copy_bits (struct frame *f, cairo_rectangle_t 
*src_rect,
   cairo_t *cr;
   GdkWindow *window;
   cairo_surface_t *surface;    /* temporary surface */
+  int scale;
 
   window = gtk_widget_get_window (FRAME_GTK_WIDGET (f));
 
@@ -2936,6 +2937,9 @@ pgtk_copy_bits (struct frame *f, cairo_rectangle_t 
*src_rect,
                                       FRAME_CR_SURFACE_DESIRED_HEIGHT
                                       (f));
 
+  scale = gtk_widget_get_scale_factor (FRAME_GTK_WIDGET (f));
+  cairo_surface_set_device_scale (surface, scale, scale);
+
   cr = cairo_create (surface);
   cairo_set_source_surface (cr, FRAME_CR_SURFACE (f), -src_rect->x,
                            -src_rect->y);