Placeholder text is partially selectable on IOS

[josephmr]

Description Placeholder text can be partially selected on IOS Safari and webview.

Recording

https://github.com/ianstormtaylor/slate/assets/28637598/e5da8b4f-0f17-4b03-a5cb-786b9dd851c7

Sandbox Reproduced on main site examples: https://slatejs.org/examples

Steps To reproduce the behavior:

1. Go to https://slatejs.org/examples
2. Erase all text in editor
3. Double click/tap on placeholder text
4. See selection

Expectation Placeholder text should not be selectable at all.

Environment

• Slate Version: 0.97.2
• Operating System: iOS
• Browser: Safari/Webview