ui/app: tweak monitor scale

Don't apply monitor scale to wayland font sizes, since it detects
the user scale itself.

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

apps/go.mod

@@ -3,7 +3,7 @@ module gioui.org/apps
 go 1.12
 
 require (
-	gioui.org/ui v0.0.0-20190710205516-4fadf71992ff
+	gioui.org/ui v0.0.0-20190711123338-478d56102a83
 	github.com/google/go-github/v24 v24.0.1
 	golang.org/x/exp v0.0.0-20190627132806-fd42eb6b336f
 	golang.org/x/image v0.0.0-20190703141733-d6a02ce849c9

ui/app/app.go

@@ -69,7 +69,7 @@ const (
 	// monitorScale is the extra scale applied to
 	// monitor outputs to compensate for the extra
 	// viewing distance compared to phone and tables.
-	monitorScale = 1.50
+	monitorScale = 1.20
 	// minDensity is the minimum pixels per dp to
 	// ensure font and ui legibility on low-dpi
 	// screens.

ui/app/os_wayland.go

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