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Building the workspace can take some time. However, thanks to Eclipse's incremental compiler, you do not need to rebuild all of it on every change.
NOTE: Dialog.java in the controls module currently gives a compiler error because of a bug in Eclipse. It can be worked around be moving the erroneous line out of the lambda expression. Remember to ignore this change when working against a revision.
JUnit tests
Eclipse can run JUnit tests as an alternative to the Gradle tasks.
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Overview
Content Tools
ThemeBuilder