[Windows] Fixed Entry Editor placeholder Text CharacterSpacing

[SubhikshaSf4851]

Note

Are you waiting for the changes in this PR to be merged?
It would be very helpful if you could test the resulting artifacts from this PR and let us know in a comment if this change resolves your issue. Thank you!

Root Cause :

The UpdateCharacterSpacing method only applied character spacing to the main text content of the TextBox

Description of Change

Enhanced the UpdateCharacterSpacing method to apply character spacing to placeholder text also.

Issues Fixed

Fixes #30071

Tested the behaviour in the following platforms

• Windows
• Android
• iOS
• Mac

Screenshot

Before Issue Fix	After Issue Fix

[Copilot]

Pull Request Overview

This PR enhances the Windows platform TextBox to apply CharacterSpacing to placeholder text and adds UI tests to verify the behavior.

• Update UpdateCharacterSpacing to also apply spacing to the placeholder element once the control is loaded.
• Introduce ApplyCharacterSpacingToPlaceholder helper method.
• Add cross-platform UI tests and a sample host app page for Issue 30071.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/Core/src/Platform/Windows/TextBoxExtensions.cs	Extend UpdateCharacterSpacing to handle placeholder; add ApplyCharacterSpacingToPlaceholder.
src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue30071.cs	New NUnit UITest to confirm placeholder spacing before and after tapping the button.
src/Controls/tests/TestCases.HostApp/Issues/Issue30071.cs	Sample page demonstrating Entry/Editor placeholder spacing change on Windows.

Comments suppressed due to low confidence (1)

src/Core/src/Platform/Windows/TextBoxExtensions.cs:76

• Consider updating the public XML documentation and any docs in /docs/ to note that placeholder text on Windows now also respects CharacterSpacing.

		public static void UpdateCharacterSpacing(this TextBox textBox, ITextStyle textStyle)

[jsuarezruiz]

/azp run MAUI-UITests-public

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[jsuarezruiz]

/azp run MAUI-UITests-public

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://github.com/dotnet/maui/main/eng/scripts/get-maui-pr.sh | bash -s -- 30324

Or

• Run remotely in PowerShell:

iex "& { $(irm https://github.com/dotnet/maui/main/eng/scripts/get-maui-pr.ps1) } 30324"

[MauiBot]

🤖 AI Summary

📊 Expand Full Review — a806563 · Updated the suggestion

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🔍 Pre-Flight — Context & Validation

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Issue: #30071 - [Windows] CharacterSpacing not applied to Placeholder text in Entry and Editor controls
PR: #30324 - [Windows] Fixed Entry Editor placeholder Text CharacterSpacing
Platforms Affected: Windows (primary), tests also run Android/iOS/Mac
Files Changed: 1 implementation, 2 test (HostApp + SharedTests), 8 snapshot images

Key Findings

• The UpdateCharacterSpacing extension method on TextBox only set textBox.CharacterSpacing, which affects the main text content but NOT the placeholder text.
• Windows TextBox placeholder is rendered via a TextBlock named "PlaceholderTextContentPresenter" inside the control template — it does not inherit CharacterSpacing from the parent TextBox.
• The fix uses GetDescendantByName<TextBlock>("PlaceholderTextContentPresenter") to locate and set CharacterSpacing directly, following the same pattern used in SearchBarExtensions.UpdateCharacterSpacing (for AutoSuggestBox).
• An OnLoaded callback is used to defer visual-tree traversal until after the TextBox is loaded, which is the established pattern in this codebase.
• Prior reviewer comment: characterSpacing type is int (matching TextBlock.CharacterSpacing) — PR author correctly justified this vs double.
• Reviewer requested extracting "PlaceholderTextContentPresenter" into a constant (nitpick, thread resolved).
• Reviewer requested updating Entry UITest Matrix for placeholder properties — PR author responded that this is already covered in the feature matrix tests.
• Labels show s/agent-review-incomplete — a prior agent review was incomplete.

Potential Concerns

• RefreshThemeResources() is called on the placeholder TextBlock after setting CharacterSpacing — SearchBarExtensions does NOT do this. This call may be unnecessary for a direct property set (not a resource key change).
• The static void ApplyCharacterSpacingToPlaceholder(this TextBox textBox, int characterSpacing) is declared as an extension method (has this keyword) but is static without access modifier (implicitly private). This is unconventional but syntactically valid.
• The constant "PlaceholderTextContentPresenter" is not extracted (reviewer nitpick was resolved/dismissed without the change being made).
• Multiple OnLoaded subscriptions if UpdateCharacterSpacing is called before the TextBox is loaded — same issue exists in SearchBarExtensions.

Fix Candidates

#	Source	Approach	Test Result	Files Changed	Notes
PR	PR #30324	Find PlaceholderTextContentPresenter TextBlock via visual tree traversal; apply CharacterSpacing directly; use OnLoaded for deferred apply	✅ PASSED (Gate)	TextBoxExtensions.cs	Follows SearchBar pattern

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🔧 Fix — Analysis & Comparison

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Fix Candidates

#	Source	Approach	Test Result	Files Changed	Notes
1	try-fix (claude-opus-4.6)	WinUI data binding: bind PlaceholderTextContentPresenter.CharacterSpacing ← TextBox.CharacterSpacing once on Loaded	✅ PASS	1 file	One-time setup; no repeated visual tree traversal; auto-syncs on property changes
2	try-fix (claude-sonnet-4.6)	Attached DependencyProperty in MauiTextBox + InvalidateAttachedProperties integration	✅ PASS	3 files (MauiTextBox.cs, TextBoxExtensions.cs, PublicAPI.Unshipped.txt)	Canonical attached-DP pattern; leverages existing SizeChanged/InvalidateAttachedProperties lifecycle
3	try-fix (gpt-5.3-codex)	ConditionalWeakTable-based sync helper: mirrors TextBox.CharacterSpacing to placeholder TextBlock on spacing changes and on load	✅ PASS	1 file	Per-TextBox callback tracking via weak table
4	try-fix (gpt-5.4)	OnApplyTemplate() override + RegisterPropertyChangedCallback(CharacterSpacingProperty) in MauiTextBox subclass	✅ PASS	2 files	Reactive callback pattern; no Loaded event needed; integrates at template-apply time
PR	PR #30324	Direct property set on PlaceholderTextContentPresenter TextBlock via visual tree traversal; OnLoaded deferral	✅ PASSED (Gate)	1 file	Original PR

Cross-Pollination

Model	Round	New Ideas?	Details
claude-opus-4.6	2	Yes	"Pure XAML TemplateBinding on PlaceholderTextContentPresenter in MauiTextBox template" — impractical (no custom XAML template exists for TextBox; would require creating a complex full template)
claude-sonnet-4.6	2	No	NO NEW IDEAS
gpt-5.3-codex	2	Yes	"Custom overlay TextBlock in MauiTextBox template replacing WinUI placeholder" — too invasive; high risk of breaking other scenarios
gpt-5.4	2	No	NO NEW IDEAS

Exhausted: Yes
Selected Fix: PR's fix — simplest (1 file), follows established SearchBar pattern exactly, minimal surface area change. Attempts 2-4 all require touching additional files or adding public API. Attempt 1 (binding) is clever but heavier than needed for a direct property sync.

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📋 Report — Final Recommendation

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✅ Final Recommendation: APPROVE

Phase Status

Phase	Status	Notes
Pre-Flight	✅ COMPLETE	Issue #30071 confirmed Windows-only; 1 implementation file + 2 test files
Gate	✅ PASSED	windows — tests fail without fix, pass with fix
Try-Fix	✅ COMPLETE	4 attempts, 4 passing; PR's fix selected as best
Report	✅ COMPLETE

Summary

PR #30324 fixes CharacterSpacing not being applied to placeholder text in Windows Entry/Editor controls. The fix correctly mirrors the existing SearchBarExtensions pattern and is well-scoped. Gate passed. All 4 alternative models also found passing solutions, but the PR's approach is the simplest and most consistent with the codebase. The PR is ready to merge with three minor code quality improvements noted below.

Root Cause

TextBox.CharacterSpacing on WinUI applies only to the main text content. The placeholder is rendered by a separate TextBlock named "PlaceholderTextContentPresenter" inside the control template, which does not inherit CharacterSpacing from its parent. This must be set explicitly via visual tree traversal after the template is applied.

Fix Quality

Correct and consistent. The approach follows SearchBarExtensions.UpdateCharacterSpacing exactly — find the placeholder template-part via GetDescendantByName, set CharacterSpacing, defer via OnLoaded if not yet loaded.

Selected Fix: PR's fix — 1 file, follows established SearchBar pattern, minimal surface area.

Alternative approaches explored (all passed):

• Attempt 1 (claude-opus-4.6): WinUI one-way Binding — elegant auto-sync but heavier than needed
• Attempt 2 (claude-sonnet-4.6): Attached DP in MauiTextBox + InvalidateAttachedProperties — canonical but adds public API surface unnecessarily
• Attempt 3 (gpt-5.3-codex): ConditionalWeakTable sync helper — correct but more complex
• Attempt 4 (gpt-5.4): OnApplyTemplate + RegisterPropertyChangedCallback — correct but requires additional file changes

Code Quality Observations (suggested improvements)

1. Unnecessary RefreshThemeResources() on placeholder TextBlock (line 97):
   RefreshThemeResources() is a workaround for theme toggle (issue Updating WinUI properties via resources does not take effect #7820) used when setting resource keys. Here, CharacterSpacing is a direct DP property — not a resource. SearchBarExtensions.ApplyCharacterSpacing does NOT call RefreshThemeResources() on the placeholder. This call should be removed.

2. Unintentional extension method declaration on private helper (line 91):
   static void ApplyCharacterSpacingToPlaceholder(this TextBox textBox, int characterSpacing) uses this keyword, making it a public extension method despite lacking an access modifier (it's internal only by containment). Compare with SearchBarExtensions: static void ApplyCharacterSpacing(AutoSuggestBox platformControl, int characterSpacing) — no this. Remove this.

3. Magic string not extracted to constant (line 93):
   "PlaceholderTextContentPresenter" should be extracted to a const string (noted by Copilot reviewer, thread resolved without the change being applied).

Tests

UI tests added in TestCases.HostApp/Issues/Issue30071.cs and TestCases.Shared.Tests/Tests/Issues/Issue30071.cs:

• Issue30071PlaceholderCharacterSpacingShouldApply — verifies initial CharacterSpacing=10 on both Entry and Editor placeholders via screenshot
• Issue30071PlaceholderCharacterSpacingShouldChange — verifies dynamic change to CharacterSpacing=20 via button tap + screenshot
• Snapshot images provided for Windows, Android, iOS (including iOS 26), and Mac — good cross-platform coverage
• Editor control in HostApp is missing AutomationId — acceptable since tests use VerifyScreenshot() rather than direct element interaction

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[MauiBot]

🚦 Gate - Test Before and After Fix

📊 Expand Full Gate — a806563 · Updated the suggestion

---

Gate Result: ✅ PASSED

Platform: WINDOWS · Base: main · Merge base: 794a9fa6

Test	Without Fix (expect FAIL)	With Fix (expect PASS)
🖥️ Issue30071 Issue30071	✅ FAIL — 568s	✅ PASS — 450s

🔴 Without fix — 🖥️ Issue30071: FAIL ✅ · 568s

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VSTest version 18.0.1 (x64)

Starting test execution, please wait...
A total of 1 test files matched the specified pattern.
D:\a\1\s\artifacts\bin\Controls.TestCases.WinUI.Tests\Debug\net10.0\Controls.TestCases.WinUI.Tests.dll
NUnit Adapter 4.5.0.0: Test execution started
Running selected tests in D:\a\1\s\artifacts\bin\Controls.TestCases.WinUI.Tests\Debug\net10.0\Controls.TestCases.WinUI.Tests.dll
   NUnit3TestExecutor discovered 2 of 2 NUnit test cases using Current Discovery mode, Non-Explicit run
>>>>> 4/2/2026 10:44:53 PM FixtureSetup for Issue30071(Windows)
>>>>> 4/2/2026 10:45:02 PM Issue30071PlaceholderCharacterSpacingShouldApply Start
>>>>> 4/2/2026 10:45:05 PM Issue30071PlaceholderCharacterSpacingShouldApply Stop
>>>>> 4/2/2026 10:45:05 PM Log types: 
  Failed Issue30071PlaceholderCharacterSpacingShouldApply [3 s]
  Error Message:
   VisualTestUtils.VisualTestFailedException : 
Snapshot different than baseline: Issue30071PlaceholderCharacterSpacingShouldApply.png (1.07% difference)
If the correct baseline has changed (this isn't a a bug), then update the baseline image.
See test attachment or download the build artifacts to get the new snapshot file.

More info: https://aka.ms/visual-test-workflow

  Stack Trace:
     at VisualTestUtils.VisualRegressionTester.Fail(String message) in /_/src/TestUtils/src/VisualTestUtils/VisualRegressionTester.cs:line 162
   at VisualTestUtils.VisualRegressionTester.VerifyMatchesSnapshot(String name, ImageSnapshot actualImage, String environmentName, ITestContext testContext) in /_/src/TestUtils/src/VisualTestUtils/VisualRegressionTester.cs:line 123
   at Microsoft.Maui.TestCases.Tests.UITest.<VerifyScreenshot>g__Verify|13_0(String name, <>c__DisplayClass13_0&) in /_/src/Controls/tests/TestCases.Shared.Tests/UITest.cs:line 477
   at Microsoft.Maui.TestCases.Tests.UITest.VerifyScreenshot(String name, Nullable`1 retryDelay, Nullable`1 retryTimeout, Int32 cropLeft, Int32 cropRight, Int32 cropTop, Int32 cropBottom, Double tolerance, Boolean includeTitleBar) in /_/src/Controls/tests/TestCases.Shared.Tests/UITest.cs:line 309
   at Microsoft.Maui.TestCases.Tests.Issues.Issue30071.Issue30071PlaceholderCharacterSpacingShouldApply() in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue30071.cs:line 21
   at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
   at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)

>>>>> 4/2/2026 10:45:05 PM Issue30071PlaceholderCharacterSpacingShouldChange Start
>>>>> 4/2/2026 10:45:07 PM Issue30071PlaceholderCharacterSpacingShouldChange Stop
>>>>> 4/2/2026 10:45:07 PM Log types: 
  Failed Issue30071PlaceholderCharacterSpacingShouldChange [2 s]
  Error Message:
   VisualTestUtils.VisualTestFailedException : 
Snapshot different than baseline: Issue30071PlaceholderCharacterSpacingShouldChange.png (1.16% difference)
If the correct baseline has changed (this isn't a a bug), then update the baseline image.
See test attachment or download the build artifacts to get the new snapshot file.

More info: https://aka.ms/visual-test-workflow

  Stack Trace:
     at VisualTestUtils.VisualRegressionTester.Fail(String message) in /_/src/TestUtils/src/VisualTestUtils/VisualRegressionTester.cs:line 162
   at VisualTestUtils.VisualRegressionTester.VerifyMatchesSnapshot(String name, ImageSnapshot actualImage, String environmentName, ITestContext testContext) in /_/src/TestUtils/src/VisualTestUtils/VisualRegressionTester.cs:line 123
   at Microsoft.Maui.TestCases.Tests.UITest.<VerifyScreenshot>g__Verify|13_0(String name, <>c__DisplayClass13_0&) in /_/src/Controls/tests/TestCases.Shared.Tests/UITest.cs:line 477
   at Microsoft.Maui.TestCases.Tests.UITest.VerifyScreenshot(String name, Nullable`1 retryDelay, Nullable`1 retryTimeout, Int32 cropLeft, Int32 cropRight, Int32 cropTop, Int32 cropBottom, Double tolerance, Boolean includeTitleBar) in /_/src/Controls/tests/TestCases.Shared.Tests/UITest.cs:line 309
   at Microsoft.Maui.TestCases.Tests.Issues.Issue30071.Issue30071PlaceholderCharacterSpacingShouldChange() in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue30071.cs:line 31
   at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
   at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)

NUnit Adapter 4.5.0.0: Test execution complete
[xUnit.net 00:00:00.00] xUnit.net VSTest Adapter v2.8.2+699d445a1a (64-bit .NET 10.0.0)
[xUnit.net 00:00:00.09]   Discovering: Controls.TestCases.WinUI.Tests
[xUnit.net 00:00:00.29]   Discovered:  Controls.TestCases.WinUI.Tests

Total tests: 2
     Failed: 2
 Total time: 33.7420 Seconds
Test Run Failed.

🟢 With fix — 🖥️ Issue30071: PASS ✅ · 450s

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  All projects are up-to-date for restore.
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13730067
  Graphics -> D:\a\1\s\artifacts\bin\Graphics\Debug\net10.0\Microsoft.Maui.Graphics.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13730067
  Essentials -> D:\a\1\s\artifacts\bin\Essentials\Debug\net10.0\Microsoft.Maui.Essentials.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13730067
  Core -> D:\a\1\s\artifacts\bin\Core\Debug\net10.0\Microsoft.Maui.dll
  Controls.CustomAttributes -> D:\a\1\s\artifacts\bin\Controls.CustomAttributes\Debug\net10.0\Controls.CustomAttributes.dll
  Controls.Core.Design -> D:\a\1\s\artifacts\bin\Controls.Core.Design\Debug\net472\Microsoft.Maui.Controls.DesignTools.dll
  Controls.BindingSourceGen -> D:\a\1\s\artifacts\bin\Controls.BindingSourceGen\Debug\netstandard2.0\Microsoft.Maui.Controls.BindingSourceGen.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13730067
  Controls.Core -> D:\a\1\s\artifacts\bin\Controls.Core\Debug\net10.0\Microsoft.Maui.Controls.dll
  UITest.Core -> D:\a\1\s\artifacts\bin\UITest.Core\Debug\net10.0\UITest.Core.dll
  UITest.Appium -> D:\a\1\s\artifacts\bin\UITest.Appium\Debug\net10.0\UITest.Appium.dll
  UITest.NUnit -> D:\a\1\s\artifacts\bin\UITest.NUnit\Debug\net10.0\UITest.NUnit.dll
  VisualTestUtils -> D:\a\1\s\artifacts\bin\VisualTestUtils\Debug\netstandard2.0\VisualTestUtils.dll
  VisualTestUtils.MagickNet -> D:\a\1\s\artifacts\bin\VisualTestUtils.MagickNet\Debug\netstandard2.0\VisualTestUtils.MagickNet.dll
  UITest.Analyzers -> D:\a\1\s\artifacts\bin\UITest.Analyzers\Debug\netstandard2.0\UITest.Analyzers.dll
  Controls.TestCases.WinUI.Tests -> D:\a\1\s\artifacts\bin\Controls.TestCases.WinUI.Tests\Debug\net10.0\Controls.TestCases.WinUI.Tests.dll
Test run for D:\a\1\s\artifacts\bin\Controls.TestCases.WinUI.Tests\Debug\net10.0\Controls.TestCases.WinUI.Tests.dll (.NETCoreApp,Version=v10.0)
VSTest version 18.0.1 (x64)

Starting test execution, please wait...
A total of 1 test files matched the specified pattern.
D:\a\1\s\artifacts\bin\Controls.TestCases.WinUI.Tests\Debug\net10.0\Controls.TestCases.WinUI.Tests.dll
NUnit Adapter 4.5.0.0: Test execution started
Running selected tests in D:\a\1\s\artifacts\bin\Controls.TestCases.WinUI.Tests\Debug\net10.0\Controls.TestCases.WinUI.Tests.dll
   NUnit3TestExecutor discovered 2 of 2 NUnit test cases using Current Discovery mode, Non-Explicit run
>>>>> 4/2/2026 10:52:27 PM FixtureSetup for Issue30071(Windows)
>>>>> 4/2/2026 10:52:36 PM Issue30071PlaceholderCharacterSpacingShouldApply Start
>>>>> 4/2/2026 10:52:37 PM Issue30071PlaceholderCharacterSpacingShouldApply Stop
>>>>> 4/2/2026 10:52:37 PM Issue30071PlaceholderCharacterSpacingShouldChange Start
  Passed Issue30071PlaceholderCharacterSpacingShouldApply [1 s]
>>>>> 4/2/2026 10:52:39 PM Issue30071PlaceholderCharacterSpacingShouldChange Stop
  Passed Issue30071PlaceholderCharacterSpacingShouldChange [1 s]
NUnit Adapter 4.5.0.0: Test execution complete
[xUnit.net 00:00:00.00] xUnit.net VSTest Adapter v2.8.2+699d445a1a (64-bit .NET 10.0.0)
[xUnit.net 00:00:00.09]   Discovering: Controls.TestCases.WinUI.Tests
[xUnit.net 00:00:00.25]   Discovered:  Controls.TestCases.WinUI.Tests

Test Run Successful.
Total tests: 2
     Passed: 2
 Total time: 23.1329 Seconds

📁 Fix files reverted (2 files)

• eng/pipelines/ci-copilot.yml
• src/Core/src/Platform/Windows/TextBoxExtensions.cs

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