Add some context to the code to help future improvement in this area.

internal/driver/glfw/canvas.go

@@ -105,6 +105,9 @@ func (c *glCanvas) PixelCoordinateForPosition(pos fyne.Position) (int, int) {
 }
 
 func (c *glCanvas) Resize(size fyne.Size) {
+	// This might not be the ideal solution, but it effectively avoid the first frame to be blurry due to the
+	// rounding of the size to the loower integer when scale == 1. It does not affect the other cases as far as we tested.
+	// This can easily be seen with fyne/cmd/hello and a scale == 1 as the text will happear blurry without the following line.
 	nearestSize := fyne.NewSize(float32(math.Ceil(float64(size.Width))), float32(math.Ceil(float64(size.Height))))
 
 	c.Lock()