feat: Add UnoSplashScreenScale MSBuild property to Uno.Sdk

[Copilot]

UnoSplashScreen supports a Scale metadata property in Uno.Resizetizer, but Uno.Sdk never exposed a corresponding MSBuild property — forcing users to redefine the entire UnoSplashScreen item just to set the scale.

Changes

• Uno.DefaultItems.Resizetizer.targets: Pass Scale="$(UnoSplashScreenScale)" to the default UnoSplashScreen item
• Sdk.props.buildschema.json: Add UnoSplashScreenScale, UnoSplashScreenFile, UnoSplashScreenBaseSize, and UnoSplashScreenColor to the properties section for IDE IntelliSense support (the latter three were already used in targets but undocumented in the schema)

Usage

<PropertyGroup>
  <UnoSplashScreenScale>0.5</UnoSplashScreenScale>
</PropertyGroup>

PR Type:

✨ Feature

What is the current behavior? 🤔

Uno.Sdk exposes UnoSplashScreenFile, UnoSplashScreenBaseSize, and UnoSplashScreenColor as overridable MSBuild properties, but not Scale. To control scaling, users must remove the SDK-generated default item and redefine the entire UnoSplashScreen item manually.

What is the new behavior? 🚀

Users can set <UnoSplashScreenScale> in their <PropertyGroup> and it flows through to the Scale metadata on the default UnoSplashScreen item, consistent with how UnoIconForegroundScale works for app icons.

PR Checklist ✅

Please check if your PR fulfills the following requirements:

• 📝 Commits must be following the Conventional Commits specification.
• 🧪 Added Runtime tests, UI tests, or a manual test sample for the changes have been added (for bug fixes / features) (if applicable)
• 📚 Docs have been added/updated which fit documentation template (for bug fixes / features)
• 🖼️ Validated PR Screenshots Compare Test Run results.
• ❗ Contains NO breaking changes

Other information ℹ️

The Scale metadata on UnoSplashScreen is documented in Uno.Resizetizer properties. When unset, the value passed is an empty string, which Resizetizer treats as unset (uses its own default).

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Missing prop in Uno.Sdk for UnoSplashScreen.Scale</issue_title>
<issue_description>### Current behavior

We currently have these props to customize the UnoSplashScreen.

Looking at the docs, UnoSplashScreen has a Scale property that should be customizable without needing to re-define the whole UnoSplashScreen item.

Creating a new project results in the splashscreen looking like this, depending on the image size.

If I were to define my own UnoSplashScreen in the csproj I can specify a Scale on it:

  <UnoSplashScreen Include="$(UnoSplashScreenFile)"
        BaseSize="$(UnoSplashScreenBaseSize)"
        Color="$(UnoSplashScreenColor)"
        IsDefaultItem="true"
        Scale="0.5"
        Exclude="@(UnoSplashScreen)"
        Condition="Exists('$(UnoSplashScreenFile)')" />

It then no longer clips

Expected behavior

We should have a UnoSplashScreenScale property </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Missing prop in Uno.Sdk for UnoSplashScreen.Scale #17509

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[Copilot]

Pull request overview

This PR adds an MSBuild property (UnoSplashScreenScale) to Uno.Sdk so developers can control UnoSplashScreen scaling without redefining the default UnoSplashScreen item, and updates the build schema to improve IDE IntelliSense for related splash screen properties.

Changes:

• Pass Scale="$(UnoSplashScreenScale)" into the SDK-generated default UnoSplashScreen item.
• Add UnoSplashScreenScale plus existing-but-undocumented splash screen properties (UnoSplashScreenFile, UnoSplashScreenBaseSize, UnoSplashScreenColor) to the MSBuild schema for IntelliSense.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/Uno.Sdk/targets/Uno.DefaultItems.Resizetizer.targets	Threads the new UnoSplashScreenScale property into the default UnoSplashScreen item metadata.
src/Uno.Sdk/Sdk/Sdk.props.buildschema.json	Documents splash screen-related MSBuild properties for IDE IntelliSense (including the new scale property).

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[Copilot]

In the build schema, UnoSplashScreenScale is declared as a float, but the UnoSplashScreen item metadata later in this same file declares Scale/AndroidScale/etc as int. This inconsistency can lead to confusing/incorrect IDE validation or IntelliSense when users set fractional values (e.g., 0.5). Consider aligning the schema types (e.g., update the UnoSplashScreen item metadata scale fields to float/string, or change the property type to match).

Suggested change

	"type": "float"
	"type": "int"

[unodevops]

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