Fix issue where dialog shadows may not resize

The inner size was not updated when our content forced it to.
We cannot override it or it won't shrink again, so this fixes the calculation for shadow size.

Fixes #1370

CHANGELOG.md

@@ -14,6 +14,7 @@ More detailed release notes can be found on the [releases page](https://github.c
 * [fyne-cli] Android: allow to specify an inline password for the keystore
 * Fixed Card widget MinSize (#1581)
 * Fix missing release tag to enable BuildRelease in Settings.BuildType()
+* Dialog shadow does not resize after Refresh (#1370)
 
 
 ## 1.4.1 - 20 November 2020

widget/popup.go

@@ -232,7 +232,9 @@ type modalPopUpRenderer struct {
 
 func (r *modalPopUpRenderer) Layout(canvasSize fyne.Size) {
 	padding := r.padding()
-	requestedSize := r.popUp.innerSize.Subtract(padding)
+	innerSize := r.popUp.innerSize.Max(r.popUp.Content.MinSize().Add(padding))
+
+	requestedSize := innerSize.Subtract(padding)
 	size := r.popUp.Content.MinSize().Max(requestedSize)
 	size = size.Min(canvasSize.Subtract(padding))
 	pos := fyne.NewPos((canvasSize.Width-size.Width)/2, (canvasSize.Height-size.Height)/2)
@@ -242,7 +244,7 @@ func (r *modalPopUpRenderer) Layout(canvasSize fyne.Size) {
 	innerPos := pos.Subtract(r.offset())
 	r.bg.Move(innerPos)
 	r.bg.Resize(size.Add(padding))
-	r.LayoutShadow(r.popUp.innerSize, innerPos)
+	r.LayoutShadow(innerSize, innerPos)
 }
 
 func (r *modalPopUpRenderer) MinSize() fyne.Size {