UnigramDev/Unigram/chatlist-template-init • 03bdd04 • 2 files, +45/-16
Fix NullReferenceException when the chat list loads before its template

OnLoaded dereferenced ScrollViewer.ContentTemplateRoot, but ScrollViewer is
only assigned in OnApplyTemplate, which runs on the first measure pass. A
control that is in the tree and never measured raises Loaded with the template
parts still null, and the handler threw.

The element it wants is the ItemsPresenter the template already declares, so
name it and read it with GetTemplateChild like the other parts. That drops the
dependency on the ScrollViewer's ContentPresenter having realized, and the
setup can then run from whichever of OnApplyTemplate and Loaded arrives second.

Returning early instead would have left _trackerOwner null for the session and
the swipe-between-folders carousel silently dead.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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