A note is wrongly redisplayed after reopening the sidebar if its content is cut and you return to the list view

[Softvision-MariusComan]

[Affected versions]:

• Firefox 61.0.1 and above

[Affected Platforms]:

• All Windows
• All Linux
• All Mac

[Prerequisites]:

• Have a new Firefox profile with the latest version of the "Firefox Notes" add-on (4.3.0dev), custom built on 26.07.2018, installed.
• You are logged into "Firefox Notes".

[Steps to reproduce]:

1. Open the browser with the profile from prerequisites and click the "New Note" button.
2. Write some text and select it.
3. Press the "Ctrl"+"X" keys and go back to the list view.
4. Close and reopen the sidebar.
5. Observe the "Notes" sidebar.

[Expected result]:

• There are no notes displayed in the sidebar.

[Actual result]:

• The Note from step 2 is displayed.

[Notes]:

• A side effect of this issue is that when a user has the "Notes Storage Full" message and they follow the STR, the message will be displayed indefinitely.
• This issue is not reproducible if the text is cut using the context menu option.
• Attached a screen recording of the issue: