"Show more items" tooltip placement improvement

[dkonopka]

📝 Provide detailed reproduction steps (if any)

Thanks to the toolbar grouping feature the editor looks much better on the smaller devices.

But, there is one thing we could improve - tooltip position. In the situation where an editor has small padding or margin there is a possibility of trimmed tooltip content. We know that by default "show more" button will be always the last one, so we could think about this "improvement".

It all boils down to introduce a new class of tooltip component - _sw.

cc @oleq

✔️ Expected result

What is the expected result of the above steps?

❌ Actual result

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[oleq]

What we need is another position in https://ckeditor.com/docs/ckeditor5/latest/api/module_ui_tooltip_tooltipview-TooltipView.html#member-position.

[oleq]

This should be an easy task:

• new value (actually 2 values, because in RTL we need to have it mirrored) for the property,
• simple styles
• usage in the ToolbarView

@mlewand

[Acrophost]

Looks like the issue is not reproducible on master anymore.