Fixes #10214

* add Grid#Column#get/setAssistiveCaption

* fix test and update doc

* move testGridAssistiveCaption to GridTest

* delete test file

* delete test file

* Delete GridAssistiveCaptionTest.java

* Create GridAssistiveCaptionTest

* Create GridAssistiveCaption

* Rename GridAssistiveCaption to GridAssistiveCaption.java

* Rename GridAssistiveCaptionTest to GridAssistiveCaptionTest.java

* Reformat using eclipse

Also improve naming by replacing one-letter variable names.

Also use "event" as the name for events

* Variable names to conform to naming convention.

* Use static constants where it makes sense

* adds simple fix for missing label text in grid select checkboxes

* updated comment and wording

* Unlock panel caption div hacking

Fixes #10119

* Javadoc formatting fix

* AbstractDateField.formatDate to be abstract

Remove invalidDateString paramter, as it can be deduced

* Fix test

* Remove AbstractDateField.getResolutionVariable

VAbstractTextualDate: rename updateDateVariables() to updateBufferedResolutions()

* Revert to use fixed value of MONDAY.

* release notes

* updateAndSendBufferedValues()

* Missed call to updateAndSendBufferedValues();

* release note

* Fix typos

* Fix

* Check whether className is of type string

* Move string type checker method to widget util

* Fix formatting of WidgetUtil

* Break svg into lines

* add role="row" and role="gridcell"

* optimize code and add additional rows for the header

* add simple test

* improve code and add rowgroup

* add debug log

* add more log to test

* remove debug test info and add role before appending to tr

* wording - change contains to contain

* create enum for magic strings, change comments and method signature

* rename enum to be singular and rename param roleName to role

* update javadoc, rename and make enum public

* Use .toLowerCase and .toUpperCase(Locale.ROOT)

* Spaces

* add spaces after if(

* Fix HTML tags inside code in javadoc

* only modify <table> and <tr>

* Fix javadoc

* Scheduler.ScheduledCommand and RepeatingCommand to be lambda

* Restore <table> in javadoc

* Fix docs

* Add spaces after 'if' and 'for' in JavaScript

* Revert to old format

* Remove whitespaces

* Simplify lambda expressions

And remove unneeded 'return' keyword.

* Format

Fixes #9200

This is based on discussion from vaadin/vaadin-grid#1023 .

Do not try to update the select all checkbox if it is not visible.

Fixes #10164

Opening grid editor from server side.
Fixes #8477.
Addressing #8820 will be the user's responsibility as fetching index of item might be slow.

This changes SharedState.registeredEventListeners to be a Map that keeps track of how many listeners of each type have been added, and handles unregistering of such listeners correctly.

Also adds aria-selected for grid rows.

Also removes dependency on junit.framework.TestCase .

And remove unused imports.

Also includes minor other javadoc and formatting fixes.

Converts Notification to an Extension and adds support for listening to the closing of notifications.

Fixes #888

* Navigator now by default uses pushState and normal URLs

* added documentation for pushState and updated Navigator documentation

* improving docs etc, adding one TODO to be solved before merging

* pushState/replaceState no work better with changing titles

* Making uri fragment navigator work when not using specially mapped UI

* Revert to older default, add annotation for selecting

* Fix tests, add null checks

* Reorder if-clause, fix tests

* Revert unnecessary test change

* Use correct variable in UI, fix test clean up

* Updates to JavaDocs, fix some methods and tests

* Add comments, fix test ui, TODO for fallbacks

* Navigation documentation, JavaDocs, removed TODOs

* Documentation fixes

* Improve JavaDocs

* Fix link name in documentation

* Improve throws declaration in getLocation

* Change documentation about the PushState based navigation

* Add since tags

* Add since tags for UI

Additional fixes for #10077 for browsers that do not support
document.fonts.ready by performing a delayed re-layout.

Add additional class names and style to components and error indicators to distinguish different error levels.

Vaadin 8 implementation of #9816. Cherry picked changes and added compatibility package component changes and tests.

Resolves #3139

If a GridLayout is used and font loading is not complete, force another layout after all fonts are loaded.

Fixes #9921
Fixes #8207