different porcupine processes don't communicate together

[Akuli]

it's possible to have the same file opened at the same time in two different porcupines, that can be confusing, especially because porcupine doesn't detect if another program has changed a file (related to #30 )

there's porcupine/_ipc.py but that appears to be something that i decided to not use for whatever reason

[Akuli]

also creates funny behaviour with porcupine.settings

[rdbende]

Yesterday I made a shell launcher script and a desktopfile for Porcupine, so I can launch it from my panel, and assign it to files to open with. However it's very annoying, that whenever I double-click on a file, it opens a new Porcupine instance. Ideally there could be an setting to Allow only single Porcupine instance, but at least a --new-tab option.

[Akuli]

Not being able to drag tabs into an existing Porcupine instance makes this even worse: once you have two files you want to work on in separate porcupines, the only way to bring them under the same porcupine is to open the file again.