Snippet Editor fails to open after closing any file tab

[FirehaK]

Version and Platform (required):

• Binary Ninja Version: 3.1.3592-dev
• OS: Windows
• OS Version: 11
• CPU Architecture: x64

Bug Description: The Snippet Editor window will not open if any file tabs have been closed.

Steps To Reproduce: Please provide all steps required to reproduce the behavior:

1. Open any number of files for analysis
2. Close a file tab
3. Attempt to open the Snippet Editor
4. See error in log

Expected Behavior: I expected Snippet Editor to open regardless of what tabs have been closed.

Screenshots: If applicable, please add screenshots here to help explain your problem.

Additional Information: After closing any tab and attempting to open Snippets, the following output can be seen in the log:

Traceback (most recent call last):
  File "C:\Users\<USER>\AppData\Roaming\Binary Ninja\plugins\snippets-master\__init__.py", line 707, in launchPlugin
    snippets.show()
RuntimeError: Internal C++ object (Snippets) already deleted.

Restarting Binary Ninja is required to open the Snippet Editor again.

[psifertex]

This is a dupe but on another repo that I'm about to migrate it to. Appreciate the heads up, it's unfortunately a side effect of a change a while ago that made snippets non-modal which was nice to be able to flip back and forth but it wasn't designed for that and this is the side effect of it.

[psifertex]

Duplicate of #23