Some shortcut keys don't work correctly on editor with Visual mode

Issue Summary

Some shortcut keys don't work correctly on editor with Visual mode.

Environment

Tested with the following browsers

• Chrome : Version 72.0.3626.81 (Official Build) (64-bit)
• Firefox : 65.0 (64 bit)

Steps to Reproduce

Please just pressing the short cut keys listed below in the editor.

Expected Results

The following short cut keys work correctly.

• Command+Shift+S or Ctrl+K : Strikethrough
• Command+K or Ctrl+K : Link
• Command+B or Ctrl+B : Bold
• Command+I or Ctrl+I : Italic
• Command+U or Ctrl+U : Underline
• Command+Shift+B or Ctrl+Shift+B : Bullet list
• Command+Shift+N or Ctrl+Shift+N : Numbered list

Actual Results

Some of the shortcuts are not working correctly with Visual mode.

Shortcut	What it does?	Works for Visual mode?
Ctrl+Shift+S    command+shift+S	Strikethrough
Ctrl+K    Command+K	Link
Ctrl+B    Command+B	Bold
Ctrl+I    Command+I	Italic
Ctrl+U    Command+U	Underline
Ctrl+Shift+B    Command+Shift+B	Bullet list
Ctrl+Shift+N    Command+Shift+N	Numbered list

Workaround

Please change the editor mode to Text mode when you use the shortcuts.