Double-clicking tray icon opens then closes CopyQ

**Describe the bug**
Double-clicking CopyQ's tray icon opens then closes CopyQ after a short delay. This is due to the _Close When Unfocused_ option being enabled.

**To Reproduce**
Steps to reproduce the behavior:
1. Double-click the CopyQ tray icon.

**Expected behavior**
Regardless of single or double-click, or _Close When Unfocused_ state, open the CopyQ window, and stay open. Essentially, if the tray is triggered in quick succession (a double-click), ignore _Close When Unfocused_ logic until a short grace period has passed.

**Version, OS and Environment**
CopyQ 6.4.0
Windows 11 Pro 10.0.22621

**Additional context**
On Windows, some tray icons require only a single-click, others a double-click, to open a program's window, but in all cases that I'm aware of, a program doesn't open then close if a double-click is sent rather than a single-click. Muscle memory shouldn't need changing to accommodate this in my opinion, nor require losing _Close When Unfocused_ functionality.