show What's New dialog when launching updated version

ui/dialogs/aboutdialog.go

@@ -66,8 +66,8 @@ func (a *AboutDialog) buildMainTabContainer(version string) *fyne.Container {
 	ts := license.Segments[0].(*widget.TextSegment)
 	ts.Style.TextStyle.Bold = true
 	ts.Style.Alignment = fyne.TextAlignCenter
-	ghUrl, _ := url.Parse("https://github.com/dweymouth/supersonic")
-	kofiUrl, _ := url.Parse("https://ko-fi.com/dweymouth")
+	ghUrl, _ := url.Parse(res.GithubURL)
+	kofiUrl, _ := url.Parse(res.KofiURL)
 	githubKofi := container.NewCenter(
 		container.New(&layouts.HboxCustomPadding{DisableThemePad: true, ExtraPad: -10},
 			widget.NewHyperlink("Github page", ghUrl),

ui/dialogs/whatsnewdialog.go

@@ -0,0 +1,51 @@
+package dialogs
+
+import (
+	"net/url"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/widget"
+	"github.com/dweymouth/supersonic/res"
+	"github.com/dweymouth/supersonic/ui/layouts"
+)
+
+type WhatsNewDialog struct {
+	widget.BaseWidget
+}
+
+func NewWhatsNewDialog() *WhatsNewDialog {
+	w := &WhatsNewDialog{}
+	w.ExtendBaseWidget(w)
+	return w
+}
+
+func (w *WhatsNewDialog) CreateRenderer() fyne.WidgetRenderer {
+	objects := container.NewVBox()
+	if res.WhatsAdded != "" {
+		added := widget.NewRichTextFromMarkdown(res.WhatsAdded)
+		added.Wrapping = fyne.TextWrapWord
+		objects.Add(added)
+	}
+	if res.WhatsFixed != "" {
+		fixed := widget.NewRichTextFromMarkdown(res.WhatsFixed)
+		fixed.Wrapping = fyne.TextWrapWord
+		objects.Add(fixed)
+	}
+
+	ghUrl, _ := url.Parse(res.GithubURL)
+	kofiUrl, _ := url.Parse(res.KofiURL)
+	githubKofi := container.NewCenter(
+		container.New(&layouts.HboxCustomPadding{DisableThemePad: true, ExtraPad: -10},
+			widget.NewHyperlink("Github page", ghUrl),
+			widget.NewLabel("·"),
+			widget.NewHyperlink("Support the project", kofiUrl)))
+	objects.Add(githubKofi)
+
+	c := container.NewVScroll(objects)
+	return widget.NewSimpleRenderer(c)
+}
+
+func (w *WhatsNewDialog) MinSize() fyne.Size {
+	return fyne.NewSize(400, 250)
+}