- 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

Also prevents opening FileSystem for unknown schemes.

Modified cherry-picks of https://github.com/vaadin/flow/pull/11072 ,
https://github.com/vaadin/flow/pull/11147 , and
https://github.com/vaadin/flow/pull/11235

* fix: add JavaDoc warning to avoid using ResponseWriter for directories

Cherry-picked from: https://github.com/vaadin/flow/pull/11112

- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.38.v20210224...jetty-9.4.41.v20210516)

---
updated-dependencies:
- dependency-name: org.eclipse.jetty:jetty-servlets
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

* Small updates to servlet container test setup.

- Upgraded to use cargo-maven3-plugin since cargo-maven2-plugin is now
EOL.
- Defined supported packagings as the current jetty-maven-plugin default
only covers war.
- Changed a test pojo to implement Serializable in order to prevent an
error in cargo-maven3-plugin stop-container phase.

Fixes #12310

Fixes concurrency issue with UUIDBroadcasterCache that may lead to loss of packets and thus repeated resynchronizations when using Push.

* Updated comparison screenshots for servlet containers module.

- 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.

Fixes: https://github.com/vaadin/framework/issues/12285

* Test screenshots for Firefox

Bumps commons-io from 2.4 to 2.7.

Signed-off-by: dependabot[bot] <support@github.com>

* Attempts to reduce test flakiness

Fixes #10435

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>

- Added check for touch move event in order to allow the same flow for
both mouse and touch events when dragging a Window by its header.
- Can be tested with SubwindowDraggability class.

Fixes #12257

Co-authored-by: Jakub Antoniak <j.antoniak8@gmail.com>

* Add ErrorHandler to AbstractTestUI

This reverts commit 8c39731123.

Avoids dependency security alert

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

#12132 fixed an old bug, conversion was not done back, which was a regression from Vaadin 7. However since the bug has been present long time, it has become established behavior, thus there may be need to disable conversion back to presentation sometimes, thus this API as added.

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

* Fix updating Escalator's physical row index.

- Physical index should take into account that more than one row can
have a spacer. Physical index has no practical effect on how Grid looks
like or behaves, since Escalator by design operates independently of it
and the visual positioning of elements is based on the logical and
visual indices. Physical index only affects the order of elements
within the DOM tree, where a mismatch can cause confusion during
debugging.

- 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

Fixes: https://github.com/vaadin/framework/issues/12207

* 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.