Fix font rendering blurring

Author: songww

src/vimview/gridview.rs

@@ -4,6 +4,7 @@ mod imp {
     use std::rc::Rc;
 
     use glib::translate::{from_glib_none, ToGlibPtr};
+    use gtk::traits::WidgetExt;
     use gtk::{gdk::prelude::*, graphene::Rect, subclass::prelude::*};
     use parking_lot::RwLock;
 
@@ -170,7 +171,10 @@ mod imp {
             }
             snapshot.append_color(&background, &rect);
 
+            let scale_factor = widget.scale_factor();
             let cr = snapshot.append_cairo(&rect);
+            cr.target()
+                .set_device_scale(scale_factor as f64, scale_factor as f64);
 
             let mut y = metrics.ascent();