v1.06 — Fix product key paste across all 5 fields

- Use DataObject.Pasting handler to intercept paste before MaxLength truncation
- Full key paste (e.g. XXXXX-XXXXX-XXXXX-XXXXX-XXXXX) distributes across all boxes
- Works when pasting into any of the 5 fields

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

InstaSoftOfficeTool.csproj

@@ -9,9 +9,9 @@
     <Company>InstaSoft Zrt.</Company>
     <Product>InstaSoft Office Tool</Product>
     <Copyright>Copyright (c) InstaSoft Zrt. 2026</Copyright>
-    <Version>1.0.5</Version>
+    <Version>1.0.6</Version>
-    <AssemblyVersion>1.0.5.0</AssemblyVersion>
+    <AssemblyVersion>1.0.6.0</AssemblyVersion>
-    <FileVersion>1.0.5.0</FileVersion>
+    <FileVersion>1.0.6.0</FileVersion>
     <ApplicationManifest>app.manifest</ApplicationManifest>
     <LangVersion>latest</LangVersion>
   </PropertyGroup>

MainWindow.xaml

@@ -42,7 +42,7 @@
                                    Foreground="{StaticResource TextSecondaryBrush}" Margin="0,-2,0,0"/>
                     </StackPanel>
                 </StackPanel>
-                <TextBlock Text="v1.05" HorizontalAlignment="Right" VerticalAlignment="Center"
+                <TextBlock Text="v1.06" HorizontalAlignment="Right" VerticalAlignment="Center"
                            FontSize="12" Foreground="{StaticResource TextSecondaryBrush}"/>
             </Grid>
         </Border>

Pages/ProductKeyPage.xaml.cs

@@ -27,6 +27,40 @@ namespace InstaSoftOfficeTool.Pages
                     _keyBoxes[i].Text = parts[i];
                 }
             }
+
+            // Intercept paste on all boxes
+            foreach (var box in _keyBoxes)
+            {
+                DataObject.AddPastingHandler(box, OnPaste);
+            }
+        }
+
+        private void OnPaste(object sender, DataObjectPastingEventArgs e)
+        {
+            if (!e.DataObject.GetDataPresent(typeof(string))) return;
+
+            var pasted = (string)e.DataObject.GetData(typeof(string));
+            var allAlphaNum = Regex.Replace(pasted, "[^A-Za-z0-9]", "");
+
+            // Only intercept if it looks like a full key (more than 5 chars)
+            if (allAlphaNum.Length <= 5) return;
+
+            e.CancelCommand(); // prevent default paste
+
+            _suppressAutoTab = true;
+            for (int i = 0; i < 5; i++)
+            {
+                int start = i * 5;
+                if (start < allAlphaNum.Length)
+                {
+                    int len = System.Math.Min(5, allAlphaNum.Length - start);
+                    _keyBoxes[i].Text = allAlphaNum.Substring(start, len).ToUpper();
+                }
+            }
+            _suppressAutoTab = false;
+            _keyBoxes[4].Focus();
+            _keyBoxes[4].CaretIndex = _keyBoxes[4].Text.Length;
+            ValidationMessage.Visibility = Visibility.Collapsed;
         }
 
         private void KeyBox_TextChanged(object sender, TextChangedEventArgs e)
@@ -36,28 +70,6 @@ namespace InstaSoftOfficeTool.Pages
             var tb = (TextBox)sender;
             var raw = tb.Text;
 
-            // Detect full key paste (contains dash or longer than 5 chars with alphanumerics)
-            var allAlphaNum = Regex.Replace(raw, "[^A-Za-z0-9]", "");
-            if (allAlphaNum.Length > 5 && tb == _keyBoxes[0])
-            {
-                // Full key pasted — distribute across all boxes
-                _suppressAutoTab = true;
-                for (int i = 0; i < 5; i++)
-                {
-                    int start = i * 5;
-                    if (start < allAlphaNum.Length)
-                    {
-                        int len = System.Math.Min(5, allAlphaNum.Length - start);
-                        _keyBoxes[i].Text = allAlphaNum.Substring(start, len).ToUpper();
-                    }
-                }
-                _suppressAutoTab = false;
-                _keyBoxes[4].Focus();
-                _keyBoxes[4].CaretIndex = _keyBoxes[4].Text.Length;
-                ValidationMessage.Visibility = Visibility.Collapsed;
-                return;
-            }
-
             // Clean non-alphanumeric chars
             var cleaned = Regex.Replace(raw, "[^A-Za-z0-9]", "");
             if (cleaned != raw)