Hidden fields shouldn't have in-row spacing

[alexcui03]

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Description

Example:
The above block has a hidden field '+', and that field in the below block is visible.

The above block has an extra in-row spacing after the hidden field. According to RenderInfo.getInRowSpacing_ and RenderInfo.addElemSpacing_, the renderer will always create a spacer whether the field is visible or not. The expected behavior should be that there's only one spacing between two visible fields.

A possible solution is to add/remove fields instead of setting the visibility of fields. Since hidden fields also have some other rendering bugs (like #3223), maybe the visibility of fields should be deprecated?

Reproduction steps

1. Create a block with a hidden field.

Stack trace

Screenshots

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Browsers

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