Allow launching multiple instances

[teackot]

Is your feature request related to a problem? Please describe.
I find this app useful to check if two files are identical, right now I have to copy two hashes into a text editor and compare them there.

Describe the solution you'd like
Allow opening multiple windows of the app.

[GeopJr]

Thanks for raising this issue!

Allowing multiple instances does sound interesting and I'll definitely get on it, however your use case seems to be already covered:

1. Open the first file by clicking on the "Open a File" button in the welcome view
   

2. Select the verify tab from the headbar:
   
   

3. Click on the button under the title "File" and select the file you want to check against:
   
   

If that is not your use case, please explain it below!
If that was your use case, it appears that the current design of the Verify view is not clear enough...

(just to explain the usage of the verify tab: they are tools to check against the current open file

the text filed checks if the input matches any of the hashes of foo.txt
the file button checks if a hash of the selected file matches any of the hashes of foo.txt)

[teackot]

Oh! I guess I'm just blind and didn't check out the verify tab in a hurry, otherwise it's pretty obvious what this tab does. Anyway, I think multiple instances is still a good thing to have

[DodoLeDev]

With the ability to open files directly from the command line, you are “theoretically” able to open multiple files with Collision.
But for now, the program just doesn't handle it correctly!
It seems that launching a new instance of Collision......merges the window content with the already-existing window! xD

First file	Second file	Sum of both

[GeopJr]

Nice catch! Thanks for the report!

It should be fixed as of #124