Editor freezes indefinitely when copy pasting a lot of characters in the UI Builder’s “Add new selector” field

Unity: UI Builder

Won't Fix

6.6.X

6.5.X

6.4.X

6.3.X

6.0.X

Given the limited resources, we typically don't fix issues caused by an input that is unreasonably large. Most of the time, these delays are "by design" since the Editor has a lot of data to process.

Steps to reproduce:

Create a new Unity project using the Universal 3D template
Open the UI Builder window (Window > UI Toolkit > UI Builder)
Keep copy pasting a lot of characters in the "Add new selector" field
Observe the Editor

Actual results: The Editor freezes

Expected results: There is a character limit in the field or the Editor does not freeze

Reproducible with versions: 6000.0.70f1, 6000.3.11f1, 6000.4.0b12, 6000.5.0a9{}

Tested on (OS): Ubuntu 24.04, MacOS Silicon Tahoe 26.2

Editor freezes indefinitely when copy pasting a lot of characters in the UI Builder’s “Add new selector” field

Unity: UI Builder

Won't Fix

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Have a workaround or additional info about this issue?

Editor freezes indefinitely when copy pasting a lot of characters in the UI Builder’s “Add new selector” field

Unity: UI Builder

Statuses

Won't Fix

Resolution Notes

6.6.XWon't FixGiven the limited resources, we typically don't fix issues caused by an input that is unreasonably large. Most of the time, these delays are "by design" since the Editor has a lot of data to process.

Description

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Have a workaround or additional info about this issue?