[Feature] Consider undeprecating should_launch_new_instance

[danielml-mx]

Currently there is no intuitive way to open multiple documents with sioyek on both different windows and different instances. This leads to some issues with interfaces that expect different instances for every document opened.

Notice in this example how my terminal/WM swallows the first window I open but doesn't swallow the other (new) windows, and they all close when I press Q to quit since they are all within the same instance (I assume this is intended behavior, but I find it really unintiutive). Having all of them in a different instance would fix these issues.

out.mp4

[danielml-mx]

Here's the expected behavior (using the build in the synctex_update branch):

screencapture-020225-185907.mp4

Each document gets opened in a different window and instance, gets swallowed properly and quitting one doesn't quit the other.

[ahrm]

There is a way to launch new instances by specifying the name in the development branch as of this commit: 4c99080. You should pass the --instance-name command line option.