Fix selection with autofocus when editor content is empty on startup

[mmachatschek]

Fixes #1588

It seams that the selection of the anchor and head is not zero based.

When initializing an empty editor and setting the focus by clicking into the editor. The editor.state.selection will have:

selection: Object
- type: "text"
- anchor: 1
- head: 1

[mmachatschek]

@hanspagel I couldn't find an appropriate test for this where I can put this, as the only error that happens without the fix is the one I describe in my issue.

But maybe a vue/react component could be added here: https://www.tiptap.dev/api/commands/focus

[hanspagel]

Thanks! I think it was 0 for a reason, but I’m not sure. I need to check this before merging.

[BrianHung]

I was digging through prosemirror-state, and the way selection is instantiated by default is by using Selection.atStart.

Using that function should give you a valid position or selection independent of the topNode (default doc might be doc -> paragraph, which gives offset of 1 but another doc could be doc -> blockquote -> paragraph which gives offset of 2).

[philippkuehn]

Thanks for that hint @BrianHung! I was able to fix it with that patch so I’m closing this.

[mmachatschek]

Thanks @BrianHung and @philippkuehn for fixing and looking into this 🙌