[BUG] Modal Shadow Mismatch and can't Resize

[AlbinoGeek]

Describe the bug:

The shadow of a Modal does not match up with it's size/contents when it contains a long label.

To Reproduce:

Full code attached.

Screenshots

Without Wrap

With Wrap

With Reload

( no change )

With Resize then Reload

( no change )

Putting modal.Show() Last

( no change )

Example code:

func main() {
	fyneApp = app.New()
	fyneApp.Settings().SetTheme(theme.DarkTheme())

	mainWindow = fyneApp.NewWindow("Hello, Fyne!")
	hello := widget.NewLabel("Hello Fyne!")
	mainWindow.SetContent(widget.NewVBox(
		hello,
		widget.NewButton("Hi!", func() {
			hello.SetText("Welcome :)")
		}),
	))

	mainWindow.Resize(fyne.NewSize(420, 360))
	mainWindow.CenterOnScreen()
	mainWindow.Show()

	label := widget.NewLabel("This is some really long text, and we know it will not fit on the screen, because this does not wrap by default.")
	modal := widget.NewModalPopUp(
		widget.NewCard("Welcome!", "First-Time Setup",
			widget.NewVBox(
				label,
			),
		), mainWindow.Canvas())
	// label.Wrapping = fyne.TextWrapWord
	modal.Show()

	// modal.Resize(fyne.NewSize(400, 340))
	// mainWindow.Canvas().Refresh(modal)
	// modal.Refresh()

	fyneApp.Run()
}

Device (please complete the following information):

• OS: Fedora
• Version: 33
• Go version: 1.15.2 linux/amd64
• Fyne version: 1.4.0

[andydotxyz]

I am pretty confident that this is because the label will resize to accomodate the wrap.
That makes this a duplicate of a ticket we hoped to resolve soon, #1370

[andydotxyz]

Tested locally and #1613 resolves this issue