hello，i am new with prosemirror 。Recently I used it to develop my editor , but i found that if i import exist doc into editor , the whitespace at the beginning of the paragraph disappears , whitch is based on the normal paragraph define:
paragraph: {
content: "inline*",
group: "block",
defining: true,
parseDOM: [{tag: "p"}],
toDOM() { return ["p", 0] }
},
so I decide to change the way to define it to retain the whitespace like this:
paragraph: {
attrs: {
content: {default: ''}
},
content: "inline*",
group: "block",
defining: true,
parseDOM: [{
tag: 'p',
getAttrs(dom) {
let content = dom.innerHTML
return {
content:content
}
}
}],
toDOM(node) {
let pDom = document.createElement('p')
pDom.innerHTML = node.attrs.content
return pDom
}
},
but it will cause a crash with
like:
On this issue, I don’t know what to do now 
. How can I keep the space at the beginning of the paragraph,I hope I can get your help. Thank you very much