New windows are opening instead of using existing windows

[UvuvDev]

Version and Platform (required):

• Binary Ninja Version: 6.0.10495
• Edition: Ultimate
• OS: MacOS
• OS Version: Beta 27.0 26A5406E
• CPU Architecture: M3 Pro

Bug Description:
During certain operations, particularly when the UI is open and binary ninja is opened from the command line, window management seems to break. For this specific issue, it's spawning a new window instead of using the existing one when launching a .bndb. However, there may be a wider issue, as I've had bugs where the window won't open at all from CLI but be selected by the toolbar, and will only appear after clicking the icon (un-reproducible for me, which is why I haven't made it a separate issue).

Steps To Reproduce:

1. Close all running instances of Binary Ninja
2. Run binaryninja from the CLI to open:
   • Windows: C:\windows\notepad.exe
   • Linux: /bin/ls
   • macOS: /bin/ls (select an object, arm64e or x86_64)
3. Ensure it opens the file correctly, with no error
4. Make note of the entry point function, then save a BNDB
5. Open a new tab
6. Run binaryninja from a new CLI with the path to the BDNB, ensure you get a confirmation prompt in the running instance, click Yes
7. Observe that it opens a new window instead of activating the tab with the BNDB in it

Although inconsistently, this can cause a new window to show up.

Expected Behavior:
It should open the tab that has the file open already.

Screenshots/Video Recording:

Binary:
/bin/ls on macOS

[bdash]

This is expected behavior on macOS at present. Previously macOS did use the URLHandlerThread logic used on Windows and Linux to try to reroute this sort of thing to an existing instance, but it caused problems and so was disabled somewhere around v5.1.

The current behavior on macOS is that running the app binary directly from the command line spawns an independent instance. We rely on macOS to route "open document" events to an already running copy when you double-click on a file in Finder. Similarly, macOS will simply activate the existing instance if you double-click on the same app within your Applications folder or activate it via Spotlight.