* Improve thread safety (#12395)

See: https://vaadin.com/forum/thread/17522264/concurrentmodificationexception-in-vaadin-shared-on-karaf-4-2-x

* Fix incompatible selenium version in test module. (#12397)

* Fixed a dependency version in a karaf test module. (#12399)

* Checkstyle tweaks to DateField widgets. (#12400)

- Added and updated JavaDocs.
- Updated comments.
- Updated to use non-deprecated method calls.
- Removed unnecessary warning suppressions.
- Suppressed warnings for unavoidable deprecation.

* fix: set Vaadin session attribute using lock in reinitializeSession (#12401)

* Cherry picked unit test from Flow

See https://github.com/vaadin/flow/pull/11538

* Fix missing import

* Cherry pick fix from Flow

* deprecate vaadin-snasphots repo (#12405)

* deprecate vaadin-snasphots repo

* Update chrome version to 93

* add more screenshots

* fix: Add MPR UI id request parameter (#12412)

* fix: Add MPR UI id request parameter

Related-to https://github.com/vaadin/multiplatform-runtime/issues/85

* test: Remove redundant non-empty param test

* test: Remove leftovers

* fix: Init window.mprUiId earlier than window.vaadin

* Add missing '='

* Update links shown by license checker (#12402)

vaadin.com/pro does no longer have the info

* fix: Add row limit to DataCommunicator row data requests (#12415)

* Add row limit to DataCommunicator row data requests

* Add missing constant

* Add unit test

* Add test for extending Grid

* Fixed test

Co-authored-by: Tatu Lund <tatu@vaadin.com>
Co-authored-by: Anna Koskinen <Ansku@users.noreply.github.com>
Co-authored-by: Zhe Sun <31067185+ZheSun88@users.noreply.github.com>
Co-authored-by: Mikhail Shabarov <61410877+mshabarov@users.noreply.github.com>

* deprecate vaadin-snasphots repo

* Update chrome version to 93

* add more screenshots

Fixes #12377

- Always update the availability request range when more or less data
becomes available. Otherwise e.g. programmatically expanding a TreeGrid
row can lead to discarding a lot of the new data right after receiving
it.

Fixes #12372

Fixes #11673

- Added and corrected JavaDocs.
- Deprecated unused public methods.
- Fixed first tab style logic in TabSheet.
- Fixed navigation focus logic in TabSheet.
- Fixed tab width bookkeeping for scrolling TabSheet tabs.
- Renamed private methods and variables for clarity.
- Removed unnecessary or duplicated private methods.
- Reworked some logic to clarify it and to better match my understanding
of what's supposed to happen within those methods.
- Updated some deprecated method calls to use currently recommended
solutions.
- Added and updated regression tests.

- Added, completed, and corrected JavaDocs.
- Added an assert to enforce a condition that has always been required.
- Added default sections to switch blocks.
- Added wildcards.
- Deprecated unused methods and variables.
- Removed inner assignments.
- Removed unused private variables and calls that do nothing.
- Updated deprecated calls to use currently recommended versions.
- Updated warning suppressions.
- ...and some auto-formatting.

Fixes #12341

- removed unused private methods
- removed unused private variables
- removed unnecessary initializations
- removed unnecessary substring(0)
- removed inner assignments
- renamed private methods that started with upper case
- renamed static final variables to use upper case
- converted to use non-deprecated options
- suppressed unavoidable warnings
- divided long Strings to multiple lines
- added missing types
- added missing JavaDoc parameters
- formatting
- updated comments & JavaDocs

Fixes: #12328

Fixes #12310

- Backspace navigation hasn't worked in years thanks to new browser
standards, removed related tests. Left a test for regular backspace use
within a modal window.
- Enabled a modal window test for Chrome since it seems to be working
now, removed extending of another test class to avoid running the tests
twice without any configuration changes.
- Adjusted browser width limitation.
- Added screenshots.

* Test screenshots for Firefox

* Attempts to reduce test flakiness

Handle possible race condition by disabling the editor's widget while awaiting validation from the server.

Fixes #12270

* Add browser specific handling in setRows

Fixes: https://github.com/vaadin/framework/issues/10138

Fixes: https://github.com/vaadin/framework/issues/7878

* Enforced minimum height to 1 rows and added a test.

Co-authored-by: Anna Koskinen <anna@vaadin.com>

* Add ErrorHandler to AbstractTestUI

This reverts commit 8c39731123.

- Override ParallelRunner of TestBench 5.2.0 for uitest module in order
to intercept and log uncaught exceptions in
TBMethod.invokeExplosively(...).

Fixes: https://github.com/vaadin/framework/issues/12240

- Old details should close.
- New details should open.
- If some row has details in both old and new item set, the details row
contents should get updated.
- Updating details row contents should not break the positioning of the
rows and details below.

Fixes #12211

* Update copyright year range.

- These plugins cause significant problems for many Windows developers,
and since most active maintainers are currently included in that group,
the plugins have been deemed more trouble than they are worth.

* Fix displaying checkboxes within Grid editor row.

- Checkbox margins should match regular row content margins.
- Multiselect checkbox label should only be visible for assistive
devices.

- null check to prevent NPE from the merged column headers
- convert to internal columnIds for merge handling
- use correct cell in merge handling
- switch away from streams in merge handling for easier readability
- regression test

Fixes: #10464

Do not fire DateField's value change event if the new date is not within the range.

Fixes: #12163

This hardens the framework against a theoretical timing attack based on
comparing how quickly a request with an invalid CSRF token is rejected.

Cherry-picked from: https://github.com/vaadin/flow/pull/9875

https://github.com/vaadin/framework/pull/12043 changed resync message sending to be deferred to queue. Now also the setting of the semaphor in message handler needs to be deferred to its right place. Otherwise there is possibility for a timing glitch. I.e. MessageHandler is set to resync handling mode before message is actually send.

Fixes: https://github.com/vaadin/framework/issues/12151