Description of the Issue

v.7.8.6 introduced the ability to have multiple Vertical Edges, but it breaks an existing
feature, i.e. Split Lines (Ctrl-I) no longer works with single Vertical Edge.

Steps to Reproduce the Issue

1. Settings/Preferences/Editing/Vertical Edge Settings: enter a single number, e.g. 80, into the text box.
2. Leave "Background mode" unchecked.
3. Enter text with more than 80 characters in a single line
4. press Ctrl-I (Split Lines)

Expected Behavior

The single line is expected to split into multiple lines, where each line is less than 80 characters long.

Actual Behavior

Nothing happened after pressing Ctrl-I.

Debug Information

Notepad++ v7.8.6 (32-bit)
Build time : Apr 21 2020 - 15:17:06
Path : C:\Program Files (x86)\Notepad++\notepad++.exe
Admin mode : OFF
Local Conf mode : OFF
OS Name : Windows 10 Home (64-bit)
OS Version : 1909
OS Build : 18363.778
Plugins : mimeTools.dll NppConverter.dll NppExport.dll