Fixes#1926 : When an IPC event was processed locally, if the window was closed before the core could start, the event handler would be forever stuck in the background waiting for the core to start. We fix this by substituting QApplication::quit() by a Nexus::quit() function and a Nexus::isRunning() function, which gives us a condition for exiting blocking processEvents() loops. We cannot simply use QApplication::quit(), because this function has no effect before the start of the event loop.
The problem was further exacerbated by the Tox URI event handler being (incorrectly) blocking. The IPC owner would block in this event handler, and the sender of the event would give up waiting and process the event itself a second time, potentially triggering the first bug. We fix the event handlers accordingly to be (mostly) non-blocking.
Also fixes a related deadlock between ~Core and ~Profile in the case of an early exit
Fixes#2480
The GUI was deleting itself on logout, but was doing while deep inside the middle of GUI code, resulting in a series of use-after-free on the return path. We now freeze the GUI and logout asynchronously in a more suitable call stack.
The qTox Project is not associated with the Tox Project in any way, with the
exception of "qTox" using the Tox Projet's "toxcore" collection of libraries.
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We create a GUI class to abstract common GUI needs (showing a message box, asking a question, ...) from the actual GUI backend.
We also create a Nexus class to manage the startup and lifetime of our main systems (Core, GUI, ...) instead of delegating that to Widget.
Eventually, Widget will only be in charge of the Desktop GUI and AndroidGUI of the mobile GUI. Nexus will overview the system and GUI will provide a clean platform-independant interface.
