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Whenever a widget is opened for editing, the stetic designer immediately rewrites the gui.stetic file and removes required widget-library elements from it. If the gui.stetic file actually uses widgets declared in those assemblies, subsequent builds of the project will *not* result in the stetic designer files being regenerated. i.e. any changes you make in the visual designer will *not* be reflected in your application until you manually restore the missing widget-library references by hand-editing the file.
yea, I've been bitten in the arse by this dozens of times.
I also confirm this bug, I lost a couple of hours of work because of this.
Is this still an issue?
This bug has NOT BEEN FIXED. Absolutely ridiculous for them to allow this terrible software.
How do we fix this by hand?
I can also confirm this bug.
2017 and bug is still here.
To fix this (each time it breaks) you will need to close IDE and edit .stetic and generated .cs files in your project by hand.