Allow to override Lumo theme styles (vaadin#4121)

Fixes vaadin#4076

Correctly normalize URLs containing "/js/" and other two letter paths (…

…vaadin#4097)

* Correctly normalize URLs containing "/js/" and other two letter paths

Fixes vaadin#4096

Use the ExpectedException rule. (vaadin#4035)

* Use the ExpectedException rule.

All tests that test a thrown exception should use the
Rule ExpectedException to verify that the message
is the expected one and we fail the correct way.

Make it possible to serialize data providers (vaadin#3962)

* Make it possible to serialize data providers

Fixes vaadin#3961

Enabled state change should fire on attach and detach. (vaadin#3867)

* Enabled state change should fire on attach and detach.

method should also check if the enabled state has actually
changed so we don't fire events when things stay the same.

Update chromedriver to version 2.37 (vaadin#3845)

* Update chromedriver to version 2.37

Correct removeAllChildren() behavior when node is just attached and I…

…T test for setText() (vaadin#3771)

Fixes vaadin#43

Use latest testbench version (vaadin#3751)

Do not crash app for using different load modes (vaadin#3680)

* Do not crash app for using different load modes

It makes no sense to crash the App when developer accidentally adds the
same resource with two different load modes.
For now when duplicates are added during the same roundtrip, the more
eager load mode is used.

Fixes vaadin#3677

Inform array updaters about client size initialization (vaadin#3635)

Needed for fixing vaadin/vaadin-grid-flow#109