Fix dialogs: set parent window, show error log in scrollable view

ui/window.go

@@ -5,6 +5,7 @@ import (
 	"context"
 	"fmt"
 	"log"
+	"strings"
 
 	gtksbuilder "SystemUpdater/lib/gtks/builder"
 	"SystemUpdater/model"
@@ -170,7 +171,7 @@ func (w *Window) showUpdateDialog() {
 	state := w.st.GetState()
 
 	dialog := adw.NewMessageDialog(
-		nil,
+		&w.Window.Window,
 		"Select Components to Update",
 		"Choose which components you want to update:",
 	)
@@ -275,7 +276,7 @@ func (w *Window) runUpdate(categories []string) {
 
 func (w *Window) onRebootClicked() {
 	dialog := adw.NewMessageDialog(
-		nil,
+		&w.Window.Window,
 		"Reboot System?",
 		"The system needs to be rebooted to complete the update.",
 	)
@@ -318,7 +319,27 @@ func (w *Window) onNavigateToCategory(category string) {
 }
 
 func (w *Window) showError(title, message string) {
-	dialog := adw.NewMessageDialog(nil, title, message)
+	lines := strings.Split(message, "\n")
+	if len(lines) > 20 {
+		lines = lines[len(lines)-20:]
+	}
+	truncated := strings.Join(lines, "\n")
+
+	dialog := adw.NewMessageDialog(&w.Window.Window, title, "")
+
+	textView := gtk.NewTextView()
+	textView.SetEditable(false)
+	textView.SetCursorVisible(false)
+	textView.SetWrapMode(gtk.WrapWordChar)
+	textView.Buffer().SetText(truncated)
+
+	scrolled := gtk.NewScrolledWindow()
+	scrolled.SetHScrollbarPolicy(gtk.PolicyNever)
+	scrolled.SetVScrollbarPolicy(gtk.PolicyAutomatic)
+	scrolled.SetMinContentHeight(200)
+	scrolled.SetChild(textView)
+
+	dialog.SetExtraChild(scrolled)
 	dialog.AddResponse("ok", "OK")
 	dialog.SetDefaultResponse("ok")
 	dialog.Present()