app/internal/wm: change Options fields from values to pointers

Switching to pointer values in Options, including using window manager defaults for size and title, in preparation for updating options on the fly.

Signed-off-by: pierre <pierre.curto@gmail.com>

app/internal/wm/window.go

@@ -14,12 +14,17 @@ import (
 	"gioui.org/unit"
 )
 
+type Size struct {
+	Width  unit.Value
+	Height unit.Value
+}
+
 type Options struct {
-	Width, Height       unit.Value
-	MinWidth, MinHeight unit.Value
-	MaxWidth, MaxHeight unit.Value
-	Title               string
-	WindowMode          WindowMode
+	Size       *Size
+	MinSize    *Size
+	MaxSize    *Size
+	Title      *string
+	WindowMode *WindowMode
 }
 
 type WindowMode uint8