Can't use inline style without selecting the text first

I fixed the problem locally for the case when the caret is in the middle of some text, and you want to start typing bold for instance, but while testing this I discovered another issue: if your caret is at the start / end of the line and the line starts / ends with styled text (e.g. bold text) and you want to get out of the style (e.g. by pressing Ctrl+B to "remove" the bold style from the start / end of the line) you can't as long as there are remote changes coming. The root problem is that the code that restores the selection after a remote patch is applied doesn't support placing the caret at the start / end of the line outside the style. Here's an example:

<p><em>italic</em> other</p>

The following happens:

• the caret is initially inside the <em> tag, at the start of the "italic" text
• you press Ctrl+I to move the caret before the <em>
• a remove patch is received
• the selection is saved
• the patch is applied
• the selection is restored => here the caret ends up again inside the <em> tag at the start of the "italic" text, because the code restoring the selection thinks it doesn't make sense to have the caret between <p> and <em> and so it moves to the first text node inside the <em>. Changing this code is not trivial...

To fix this problem, I'll try to implement the following:

• whenever there is a local change, save the selection relative to the HyperJSON content that is being synchronized by ChainPad (i.e. convert the DOM selection to a text / character selection for the HyperJSON)
• transform the saved text selection using the received remote patches (which are text level patches) => this will remove the need to perform a diff between the local and the remote content to restore the selection, since we know diffing is slow
• after remote patches are applied on the edited content, convert the transformed text selection (HyperJSON) to a DOM selection and update the editor selection