[Bug Report] Created selection is not cleared when doing Ctrl+V (Paste)

[mangoafterdawn]

Describe the bug
An area selection created with TAB will not clear when doing Ctrl+V (Paste). Can lead to selections that are off-screen being affected by subsequent actions like executing a Horiz./Vert. Mirror unintentionally.
To Reproduce

1. Open a simfile
2. Place any amount of notes.
3. Create an area selection with TAB and copy the notes to clipboard.
4. Scroll to a different part of the simfile and paste the copied notes.
5. Observe the area selection still active.
6. Execute a Horizontal or Vertical mirror. It will affect both the selection and the pasted notes.

Expected behavior
On Step 4, the original behavior of ArrowVortex was to remove the area selection.

Additional context
This bug occurs on the Linux build of ArrowVortex.