From 34e78bd8c30c6f654e1850eb0562d8d6e551aa08 Mon Sep 17 00:00:00 2001
From: Copilot <198982749+Copilot@users.noreply.github.com>
Date: Fri, 15 May 2026 11:39:01 +0200
Subject: [PATCH] Add validation to prevent empty names in ImageResizer size
 presets (#45425)
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## Summary of the Pull Request

Prevents users from clearing the name field in ImageResizer size preset
edit dialog. Empty names made the UI confusing without causing errors.

## PR Checklist

- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [x] **Tests:** Added/updated and all pass
- [x] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

## Detailed Description of the Pull Request / Additional comments

Added validation guard in `ImageSize.Name` property setter:

```csharp
public string Name
{
    get => _name;
    set
    {
        if (!string.IsNullOrWhiteSpace(value))
        {
            SetProperty(ref _name, value);
        }
    }
}
```

Invalid assignments (empty, null, whitespace) are silently ignored,
preserving the existing value. This matches the existing pattern used
for `FileName` validation in `ImageResizerViewModel`.

TwoWay binding in UI causes the TextBox to revert when users attempt to
clear the field—standard behavior for required fields.

## Validation Steps Performed

- Added unit test `ImageSizeNameShouldNotBeSetToEmptyOrNull()` covering
all rejection and acceptance cases
- Verified silent rejection behavior matches `FileName` property pattern

> [!WARNING]
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> <details>
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> #### I tried to connect to the following addresses, but was blocked by
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>
> - `i1qvsblobprodcus353.vsblob.vsassets.io`
> - Triggering command: `/usr/bin/dotnet dotnet build
/home/REDACTED/work/PowerToys/PowerToys/src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.Registry/Helpers/ResultHelper.cs
/home/REDACTED/work/PowerToys/PowerToys/src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.Registry/Helpers/RegistryHelper.cs
/home/REDACTED/work/PowerToys/PowerToys/src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.Registry/Enumerations/TruncateSide.cs
/home/REDACTED/work/PowerToys/PowerToys/src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.Registry/Constants/KeyName.cs
/home/REDACTED/work/PowerToys/PowerToys/src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.Registry/Constants/MaxTextLength.cs
/home/REDACTED/work/PowerToys/PowerToys/src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.Registry/Commands/CopyRegistryInfoCommand.cs
/home/REDACTED/work/PowerToys/PowerToys/src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.Registry/Commands/OpenKeyInEditorCommand.cs
/home/REDACTED/work/PowerToys/PowerToys/src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.Re
/home/REDACTED/work/PowerToys/PowerToys/src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.Registry/CopyType.cs
/home/REDACTED/work/PowerToys/PowerToys/src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.Registry/Icons.cs`
(dns block)
>
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> </details>

<!-- START COPILOT ORIGINAL PROMPT -->



<details>

<summary>Original prompt</summary>

>
> ----
>
> *This section details on the original issue you should resolve*
>
> <issue_title>[Settings: ImageResizer] Edit size dialog: Add validation
against empty name</issue_title>
> <issue_description>There is one small thing we should add. (But I
don't know how.)
> The data in the name field of the edit dialog should be validated
against `.NullOrEmpty`!
> _Originally posted by @htcfreek in
https://github.com/microsoft/PowerToys/pull/13285#issuecomment-924113251_
>
> **Detailed description:**
> While users edit an image size in the ImageResizer settings on PT's
settings ux they are able to clear the name of the image size. This
doesn't lead to errors/exceptions, but it also doesn't make sense to
have sizes without a name. So we should prevent user from doing this in
the edit dialog.
>
> _**Note:**_
> This is the second and last change that is needed to prevent the users
from having incorrect image size settings (#8698). But I think this is
not as relevant, because a missing name won't break image resizing._
>
> ---
>
> cc: @niels9001 </issue_description>
>
> <agent_instructions>Implement a proper fix for this issue. Do NOT
create placeholder stub files. Create actual working code that addresses
the issue described. Follow PowerToys coding guidelines and
conventions.</agent_instructions>
>
> ## Comments on the Issue (you are @copilot in this section)
>
> <comments>
> <comment_new><author>@TheJoeFin</author><body>
> does this issue still happen with v0.73.0?
/needinfo</body></comment_new>
> </comments>
>


</details>



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- Fixes microsoft/PowerToys#13336

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Co-authored-by: yeelam-gordon <73506701+yeelam-gordon@users.noreply.github.com>
---
 .../Settings.UI.Library/ImageSize.cs          | 15 ++++-
 .../ViewModelTests/ImageResizer.cs            | 66 +++++++++++++++++++
 2 files changed, 79 insertions(+), 2 deletions(-)

diff --git a/src/settings-ui/Settings.UI.Library/ImageSize.cs b/src/settings-ui/Settings.UI.Library/ImageSize.cs
index 39b712d67f..c902294f2c 100644
--- a/src/settings-ui/Settings.UI.Library/ImageSize.cs
+++ b/src/settings-ui/Settings.UI.Library/ImageSize.cs
@@ -41,7 +41,7 @@ public partial class ImageSize : INotifyPropertyChanged, IHasId
     }
 
     private int _id;
-    private string _name;
+    private string _name = string.Empty;
     private ResizeFit _fit;
     private double _height;
     private double _width;
@@ -65,11 +65,22 @@ public partial class ImageSize : INotifyPropertyChanged, IHasId
         get => !(Unit == ResizeUnit.Percent && Fit != ResizeFit.Stretch);
     }
 
+    /// <summary>
+    /// Gets or sets the name of the image size.
+    /// Invalid values (null, empty, or whitespace) are silently ignored to maintain the existing name.
+    /// </summary>
     [JsonPropertyName("name")]
     public string Name
     {
         get => _name;
-        set => SetProperty(ref _name, value);
+        set
+        {
+            // Prevent setting empty or null names
+            if (!string.IsNullOrWhiteSpace(value))
+            {
+                SetProperty(ref _name, value);
+            }
+        }
     }
 
     [JsonPropertyName("fit")]
diff --git a/src/settings-ui/Settings.UI.UnitTests/ViewModelTests/ImageResizer.cs b/src/settings-ui/Settings.UI.UnitTests/ViewModelTests/ImageResizer.cs
index 15eac53645..5d30cc433c 100644
--- a/src/settings-ui/Settings.UI.UnitTests/ViewModelTests/ImageResizer.cs
+++ b/src/settings-ui/Settings.UI.UnitTests/ViewModelTests/ImageResizer.cs
@@ -313,5 +313,71 @@ namespace ViewModelTests
             Assert.AreEqual(50, imageSize.Width);
             Assert.AreEqual(50, imageSize.Height);
         }
+
+        [TestMethod]
+        public void ImageSizeNameShouldNotBeSetToEmptyNullOrWhitespace()
+        {
+            // arrange
+            ImageSize imageSize = new ImageSize()
+            {
+                Id = 0,
+                Name = "Original Name",
+                Fit = ResizeFit.Fit,
+                Width = 100,
+                Height = 100,
+                Unit = ResizeUnit.Pixel,
+            };
+
+            // Act - try to set name to empty string
+            imageSize.Name = string.Empty;
+
+            // Assert - name should remain unchanged
+            Assert.AreEqual("Original Name", imageSize.Name);
+
+            // Act - try to set name to null
+            imageSize.Name = null;
+
+            // Assert - name should remain unchanged
+            Assert.AreEqual("Original Name", imageSize.Name);
+
+            // Act - try to set name to whitespace only
+            imageSize.Name = "   ";
+
+            // Assert - name should remain unchanged
+            Assert.AreEqual("Original Name", imageSize.Name);
+
+            // Act - set name to valid value
+            imageSize.Name = "New Valid Name";
+
+            // Assert - name should be updated
+            Assert.AreEqual("New Valid Name", imageSize.Name);
+        }
+
+        [TestMethod]
+        public void ImageSizeNameShouldNotBeNullAfterConstructionWithEmptyOrMissingName()
+        {
+            // Arrange & Act - construct with default (empty) name, simulating deserialization of legacy settings
+            ImageSize defaultSize = new ImageSize();
+
+            // Assert - name should be non-null empty string, not null (prevents NullReferenceException in callers)
+            Assert.IsNotNull(defaultSize.Name);
+
+            // Arrange & Act - construct with explicit empty name
+            ImageSize emptyNameSize = new ImageSize(id: 1, name: string.Empty);
+
+            // Assert - name should remain as the initialized default, not null
+            Assert.IsNotNull(emptyNameSize.Name);
+
+            // Arrange & Act - construct with explicit null name
+            ImageSize nullNameSize = new ImageSize(id: 2, name: null);
+
+            // Assert - name should remain as the initialized default, not null
+            Assert.IsNotNull(nullNameSize.Name);
+
+            // Verify that StartsWith can be called without NullReferenceException
+            Assert.IsFalse(defaultSize.Name.StartsWith("Custom", StringComparison.InvariantCulture));
+            Assert.IsFalse(emptyNameSize.Name.StartsWith("Custom", StringComparison.InvariantCulture));
+            Assert.IsFalse(nullNameSize.Name.StartsWith("Custom", StringComparison.InvariantCulture));
+        }
     }
 }