Changes the DisplayMarkerLayer of a bookmark to use exclusive insertion strategy. This means that insertions at the start or end of the marked range should be interpreted as happening outside the DisplayMarkerLayer and not extend the range.
The current behavior of extending the range when typing outside has many points of failure as discussed in #62.
Gif of behavior after the change:
Someone depends on the current behavior.
Fix bookmarks duplication bug
Nice work here! Thanks, @Ben3eeE! 💯
Hi! Does it fix this kind of behaviour?
Thanks for the fix anyway :)