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Fixed in 1.0.0-preview.8
Votes
0
Found in [Package]
1.0.0-preview.6
Issue ID
1274846
Regression
No
UI Builder deletes the content of UXML files when dragging elements which cause 'InvalidOperationException'
How to reproduce:
1. Open the attached project (pbag-minimal.zip)
2. From the UI Builder Standard Library choose a 'Visual Element' Container and drag it in 'UXML_ItemInfo.uxml' on the '#unity-content-container'
3. Drag 'Visual Element' on 'ListView'
4. In the Library switch to the Project tab
5. Right-click on 'UXML_Base.uxml' and select 'open in UIBuilder' (changes have to be saved)
Expected result: the content of 'UXML_Base.uxml' didn't change
Actual result: the content of 'UXML_Base.uxml' is deleted completely and 'UXML_ItemInfo.uxml' is deleted partially
Reproducible with: 1.0.0-preview.1, 1.0.0-preview.5, 1.0.0-preview.6 (2019.4.10f1, 2020.1.5f1, 2020.2.0b3, 2021.1.0a1)
Could not test with: 2018.4.27f1 (package not compatible)
Notes:
1. Started getting errors at step 3: 'InvalidOperationException: You can't add directly to this VisualElement. Use hierarchy.Add() if you know what you're doing.'
2. Doesn't only reproduce with Visual Element but with other Containers and Controls
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Resolution Note (fix version 1.0.0-preview.8):
ListView is not designed to have any element added to it as child elements. The UI Builder was incorrectly allowing this. As soon as there was a refresh, ListView would reset its contents and delete any manually added elements. In UI Builder 1.0.0-preview.8, this was addressed by not allowing the addition of child elements to any such closed elements (elements that have their contentContainer set to null).