[Bug][iOS] Editor placeholder doesn't wrap

[rickclephas]

Description

The editor placeholder doesn't wrap when the text doesn't fit on a single line.
#9710 fixed the wrap issue but caused #11889 which was fixed in #11891.
Unfortunately now the wrapping is broken again.

Steps to Reproduce

1. Set a long placeholder on an editor
2. Start scrolling horizontally

Expected Behavior

The placeholder text wraps to a second line if it doesn't fit.

Actual Behavior

The editor starts to scroll horizontally.

Basic Information

• Version with issue: 4.8.0.1364
• Last known good version: unknown
• Affected Devices: all

Workaround

In a custom render we find the placeholder label:

var placeholderLabel = Control.Subviews.FirstOrDefault(view => view is UILabel);
if (placeholderLabel == null) return;

And add the following constraint to prevent the label from growing:

var widthConstraint = NSLayoutConstraint.Create(placeholderLabel, NSLayoutAttribute.Width, NSLayoutRelation.LessThanOrEqual, this, NSLayoutAttribute.Width, 1, TextView.TextContainer.LineFragmentPadding * -2);
AddConstraint(widthConstraint);