Remove Split-Kozane feature

Removed Split Kozane feature.

This was an overly abstract feature created at a time when it was not yet clear what kind of functionality was needed.

Editing with the Edit Kozane feature replaces Kozane.

https://gyazo.com/dc88bce8e7d7026200144882cd031f52

If you make multiple lines at this time, you will have multiple copies.

https://gyazo.com/c4c13c5426c9f11e3ffa3b09ff1e68b9

So the need to "add something and later split it into multiple pieces" can be realized with the Edit Kozane function.

The Split Kozane dialog had two buttons, "replace" and "add"

The idea was "Sometimes we want to keep the existing one and add a split of it."

https://gyazo.com/595f87314e6510fb529520abd2b0e69c

Notes on the current specification

When you edit a kozane, if the text is a single line, it is interpreted as editing the displayed text.

Therefore, the drawn line is maintained.

If the text is multiple lines, it is interpreted as splitting the kozane.

In this case, "old kozane" disappears and "import of multi-line text" is performed.

Therefore, lines drawn on the old sticky disappear.

The clone is interpreted as "adding a new item with the same contents," so lines are not drawn.

https://gyazo.com/97dfa6c1c9e8e2a2b71fc23182f363e7

I thought it might be a problem when I was writing the explanation, so I clearly stated it.

I have not had any trouble with this specification so far.

If you have a choice between a default specification with more lines and a default specification with no lines, you can say that you choose the one with no lines.

I think it is better not to increase the number of lines because people get confused when there are too many lines.