* Using @Delayed annotation for DateField Rpc

* Separate a rpc for handling the time change in DateTimeField

* Add test case for wrong event order

issue in #11343 and #11385 is not reproducible on top this patch
Three different bugs are involved in this fix:
we bring the old fix(#11094) back and fixed the other related issues:
1) allow adding the same new item after dataProvider got reset, This is cause by the client side parameter `LastNewItemString`, it saves the value added before resetting. 
2) clear the pending newItem eagerly, so that the same value will not be added again.

* Clicking on slider makes handler move

Fixes #1496

* Introducing control over clicking behaviour

- User will have to enable process of the click event on handle calling `slider.setEnableClickHandler(true);`
- Clean-up the handler logic in VSlider.java
- Renaming the property to `updateValueOnClick`
- Added JavaDocs
- Fixing tests

* Fixing autocompletion issue with ComboBox on newer Chrome versions

Newer Chrome versions do not work with random number hack to prevent auto completion, but it finally supports autocomplete=off.

* Merge branch 'master' into fix11437

* Merge branch 'master' into fix11437

* Merge branch 'master' into fix11437

* Merge branch 'master' into fix11437

* Merge branch 'master' into fix11437

* Merge branch 'master' into fix11437

* Merge branch 'master' into fix11437

* Merge branch 'master' into fix11437

* Fixes 11517. Use ENTER and SPACE keys as shortcuts for header buttons

* Merge branch 'master' into fix-11517

* Increase sleep time for test failing in validation

* Merge branch 'master' into fix-11517

Fixes 11528

Verify that correct mode(HTML/TEXT) of caption is set for the  Panel
Fixes #11521

Fixes #11502

* Add Test file

* Remove redundant check for for Firefox

It seems that in older versions of Firefox (at least, older than 45) the KeyPress event should be used instead of KeyDownHandler. At some point (works already on 58 version, the current one is 65) the issue was resolved and starting from Firefox 65 this hook prevents from navigating in the pop-up via keyboard.
Simply removing additional logic makes navigating in both DateField and InlineDateField possible

Fixes #11465

Checking that no prior Combobox behavior is broken

* Cleaning-up the code

Adding UI test

* Adding TestBench test

Clear contents of iframe clone that is in a Window so that when it's reattached to DOM we don't get 404

* Some formatting changes

* add client side integration for custom styles for checkbox.label and checkbox.input

* add server side integration for checkbox element styling

* add server side tests

* add client side test

* Improve VMenuBar click handling logic

During `updateFromUIDL` inside MenuBarConnector we empty and re-instantiate the components of MenuBar. When we are modifying the Menubar from the BlurEventListener of another component, we ,by this, remove widgets, therefore clickEvent is not fired and the action of the MenuItem is not proceed as a result. (The BlurEvent is fired before the click event in the chain of events. )

To improve the situation, we catch onMouseDown event , which is fired before BlurEvent,by assigning mouseDown flag to true. Then if no click event has yet happened, we delay the execution of update inside `updateFromUIDL` by default 500 ms. Then if click event occurs, it proceeds normally. The time can be increased/decreased using setter.

There is no delay, if we are clicking on the MenuBar as usual or no Blur listener is set.

This change allows setting descriptions

* Remove accidentally committed comment

* Don't update the state on the getDelayMs call

* Fixes #10814

* Add missing tests

Fixes #11374

* Move onClick logic to the Connector

Move onClick event handling from 'VNativeButton' to NativeButtonConnector. Now works as for regular button.

Also, adding propagation of the `enabled` value to the state on disableOnClick being true

Fixes https://github.com/vaadin/framework/issues/11188

Setting read-only state to CheckBoxGroup should disable adding clicking effect. Missing v-readonly style is added to every CheckBox in the component, if it's set to read-only.

Fixes: https://github.com/vaadin/framework/issues/11113

* Add file missed from initial commit

* Verifying that option is enabled

Some of the options might be disabled on there own. Verify that option is not disabled, before removing disabled styles.

* Add missing test file

* Complete the empty since tag

* Revert "Update ComboBox internal state on new item added (#11094)"

This reverts commit 56ce91c616.

* Add tests to verify the issue

Fix https://github.com/vaadin/framework/issues/11268

```buildTime()``` function re-initializes ListBoxes for hours,minutes and seconds values. We need to set correct values in those ListBoxes, before assigning value to the labels displayed instead of those ListBoxes in ReadOnly state, as , otherwise, the selectedItemIndex returns 0.

* Fixes #10937

- Previously if selected value is null, then index is set to -1; in current implementation if value is null and emptySelection is allowed then set the index to 0. (The position for the empty selection)

- Also, if changing the allowEmptySelection on the fly, ensure, that either index is to-reset to -1 by setting the selected value to null on the client-side (the value before was null) or preserve the value(value was different than empty).

* Change the test case

Since in this pr the behaviour of the NS is changed, therefore old test need to be adjusted.

Change: setting null as value will select empty selection. Before that nothing would be selected and value will be cleared.

Behaviour change in PR: Allow selecting null as value

* Rebuild calendar pop-up on readOnly state change

Fixes https://github.com/vaadin/framework/issues/6565

- When a TabSheet is scrolled to an end and then resized bigger, more
tabs should appear to the left.
- When a TabSheet is right-aligned in Valo and scrolled to the end, last
tab shouldn't be partially hidden behind the scroller buttons.
- Shouldn't allow attempts to scroll into directions where there is
nothing left to scroll to, even if the current tab isn't fully visible.

Fixes #807

Fixes #11087

Fixes #10925

Ignoring filtering options when right arrow, left arrow, home or end key is pressed.

Fixes #11016

Fixes #2410

Fixes #7820

Resolves #5891

Fixes #10652

Fixes #10514

* Disable animate-out for VWindow by default

Fixes #5891

Resolves #10541

This patch adds the ability and configuration
for running tests against cluster running Chrome
browsers in XVFB environment.

It also contains multiple fixes for combining
newer Selenium and Chrome as well as fixes
tests that depend on timezones.