domRange.setStart being called with offset of 1 on a zero length text node

[bmingles]

Description
On IOS, toDOMRange can call domRange.setStart with an invalid offset. This is caused by a conditional rendering of '\uFEFF' that gets excluded on IOS.

slate/packages/slate-react/src/components/string.tsx

Line 132 in 49ba21a

{!(IS_ANDROID || IS_IOS) || !isLineBreak ? '\uFEFF' : null}

A later call to toDOMRange can fail due to passing 1 as the offset to a textnode that has a zero length string.

slate/packages/slate-dom/src/plugin/dom-editor.ts

Line 664 in 49ba21a

domRange.setStart(startNode, isStartAtZeroWidth ? 1 : startOffset)

Expectation
toDOMRange should check for conditions that don't render the \uFEFF character and pass 0 instead of 1 to domRange.setStart in such cases.

Note that this is happening in a new SolidJS based package, so I don't have reproduction steps in slate-react, but the DOM looks like this:

Environment

• Slate Version: 111
• Operating System: MacOS
• Browser: Chrome (emulating iOS)