app/internal/window: apply font scale to dp scaling on Wayland

As discussed in gio#53, Linux font scales conflate two settings: the fractional
UI scale and the user preference as a result of conditions such as impaired
vision. The former setting should apply to both dps and sps, while the latter
only to sps. However, with the assumption that more users presumable change the
font scale for the former reason rather than the latter, we should apply the
font scale to both dps and sps in Gio.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/internal/window/os_wayland.go

@@ -198,22 +198,17 @@ func createNativeWindow(opts *Options) (*window, error) {
 			scale = s
 		}
 	}
-	ppdp := ppmm * mmPrDp
-	ppsp := ppdp * fontScale
-	ppdp *= monitorScale
+	ppdp := ppmm * mmPrDp * fontScale
 	if ppdp < minDensity {
 		ppdp = minDensity
 	}
-	if ppsp < minDensity {
-		ppsp = minDensity
-	}
 
 	w := &window{
 		disp:     conn.disp,
 		scale:    scale,
 		newScale: scale != 1,
 		ppdp:     ppdp,
-		ppsp:     ppsp,
+		ppsp:     ppdp,
 	}
 	w.notify.read = pipe[0]
 	w.notify.write = pipe[1]