- ScrollbarBundle: removed delays in scroll handling that were only
needed for IE8, added possibility to update offsetSize and scrollSize at
the same time in order to avoid triggering unnecessary scrollbar
visibility change events during the intermediate state.
- ColumnConfigurator: added new method that allows setting column widths
without triggering element size recalculations.
- EscalatorProxy: added implementation of the new method to
ColumnConfigurationProxy.
- Escalator: switched to use new methods in ScrollbarBundle and
ColumnConfigurator, added a pixel to a scrollbar offsetSize calculation
that was for some reason consistently one pixel too low, removed
duplicate method calls from sectionHeightCalculated handling as those
are already handled by the calling method and can cause incorrect
intermediate state and unnecessary scrollbar visibility change events,
added implementation of the new method to ColumnConfigurationImpl with
the element size recalculations made optional.
- Grid: updated column minimum width calculations to take into account
the potential presence of a resize handle, updated expand ratio handling
to not trigger element size recalculations until the entire handling is
finished.
- Test for column width handling when there are multiple columns with
setMinimumWidthFromContent(false)

Fixes #12139

Fixes: #12106

- If the Grid has any columns with non-fixed widths, the presence of a
vertical scrollbar affects the column width calculations. Horizontal
scrollbar should only be shown when actually needed.

Fixes #12049

* Add tests

* Fix getVisibleFrozenColumnCount() if SelectionMode is multi

Fixes #11824

The previous patch https://github.com/vaadin/framework/pull/11951 did fix the problem (frozen column indicator wrongly positioned)  it was meant to, but caused a regression in hiding / un-hiding. 

This new fix addresses both problems, i.e. it applies multiselect column compensation in other way, without causing problem in hiding / un-hiding logic

Fixes https://github.com/vaadin/framework/issues/11970

Column widths shouldn't be calculated between the clearing of cache and
re-populating it, but be delayed until the cache has some content again.
The calculations should only be triggered immediately if no rows are
expected.

Fixes #9996

* Fix an issue with frozen column count and unhiding.

Unhiding logic should take into account that there can be hidden frozen
columns that are not the column currently getting shown.

There is no need to reset the sidebar for every column that is set
hidable within the same roundtrip. Because no other layouting depends on
the sidebar contents, we can safely delay the reset until all columns
have got their hidabiity status updated. As a bonus point, when the
reset itself is delayed, the headers have time to get populated and the
sidebar button's height can be determined immediately at attach. The
reset ensures that attach is called every time a column's hidability is
changed.

* Rewrote debouncing of onResize 

Fixes https://github.com/vaadin/framework/issues/11892

* Fixing typo in variable name

* Removed outdated spacer height update from removal process.

Fixes #11856

If first attempt at scrolling doesn't succeed it's unlikely that
continuing to wait is going to make any difference. Cache should be
populated before triggering any actions that depend on the row being
visible, otherwise it should be enough to trust that scrollToRow
actually scrolls to row and once scrolling is done the row is as much in
view as it's going to get. This way we don't get into a situation where
Editor never opens because it's still waiting for that one last pixel
that can't be achieved thanks to browser zoom causing rounding errors.

Continues on #11672

- If the Grid has frozen columns zooming can cause the regular column
cells to be ever so slightly out of sync with their corresponding rows.
This difference is not noticeable to naked eye but is big enough that
it's possible to hover over the row instead of the cell, which causes an
assertion error and a big ugly error popup. Switching to logging retains
the information delivered by the assertion error for developer purposes
but makes the end user experience smoother.
- Can be tested manually with GridColumnFrozenColumn test UI.

Fixes #11198

* Catch and handle IllegalStateException

Fixes https://github.com/vaadin/framework/issues/11730

* Renaming variables

Updated row and spacer handling for Escalator.

Main changes:
- Spacers are only maintained and checked for rows that have DOM
representation, and not at all if there is no details generator. This
gives notable performance improvements to some particularly large Grids
- Escalator no longer tries to trim away any rows that don't fit within
the viewport just because a details row gets opened in Grid. This leads
to some increase in simultaneous DOM elements, but simplifies the logic
considerably. For example opening or closing details rows doesn't
require checking the overall content validity beyond the details row
itself anymore, but some repositioning at most. There are also no longer
any orphaned spacers without corresponding DOM rows.
- Spacers are better integrated into the overall position calculations.
- Some public methods that are no longer used by Escalator or have
changed functionality or order of operations. Any extending classes that
tap into row, spacer, or scroll position handling are likely to need
reworking after this update.
- Auto-detecting row height is delayed until Escalator is both attached
and displayed.

* Update the since tag

* Apply offset to column index depending on presense of selection column

After testing this manually I noticed that offset correction needs to be negative

* Add the testing UI

- Escalator should notify when an existing details row is moved to a new
index.
- Grid and DetailsManagerConnector should update their internal indexing
when details manager index changes in Escalator.

* Adding "v-grid-editor-selected" stylename in editor cell wrapper element when Grid is opened on selected row.

* Recalculate the column widths before the first row is added

Fixes #11607

* Fix grid column reordering

Fix grid column reordering when there are hidden columns and footerRow.join

* Add test

Fixes #11558

- Multiple headers shouldn't stack behind each other.
- Body rows shouldn't get stuck to default row height.
- Compatibility version's hidable row selector shouldn't try to
calculate row heights based on rows that haven't been added to DOM yet.

Fixes #7674

- More lightweight, and fixes things for any custom implementations of
Escalator as well.

Fixes #11044

Ensure that HeaderRow is not null in Grid

Fixes #10485

Fixes #10931

Fixes #10699

Fixes #7527

* @since 8.3.2

Fixes #10232

Fixes #7833