Fix: Fixed an issue where opening new columns in Columns View didn't always scroll them into view

[workbysaran]

Resolved / Related Issues
Fixed an issue where the horizontal scrollbar in Columns Layout did not automatically scroll to show newly opened folder columns, leaving them partially visible.

Closes #17755

Steps used to test these changes

1. Single folder navigation
   • Open Files app in Columns Layout view
   • Click on any subfolder
   • Verify the new column is fully visible and scrolled into view
2. Deep folder navigation with long file/folder name
   • Navigate to a deep path (e.g., C:\Users[Name]\Documents\Folder1\Folder2\My very very long folder in Windows)
   • Verify each newly opened column scrolls into view smoothly
   • Verify columns are fully visible regardless of width

[yaira2]

LGTM

[Copilot]

Pull Request Overview

This PR fixes an issue with scrolling to the end of a blade view when the scrollable width is not yet accurate. The solution defers scrolling until after the layout is updated, ensuring items are fully loaded.

• Introduced a new ScrollToEnd() method that waits for layout updates before scrolling
• Added a call to ScrollToEnd() after setting blade width in the columns layout
• Commented out the non-working immediate scroll approach in ItemsVectorChanged

Reviewed Changes

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

File	Description
src/Files.App.Controls/BladeView/BladeView.cs	Added ScrollToEnd() method with layout-deferred scrolling and commented out immediate scroll that didn't work
src/Files.App/Views/Layouts/ColumnsLayoutPage.xaml.cs	Called ScrollToEnd() after setting blade width to ensure scroll happens after layout completes

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[yaira2]

@workbysaran thank you!