Previously HiDPI support is conditionally enabled based on compilation
parameters as well as environmental variables which makes binary
distribution difficult. This commit automatically enables runtime DPI
scaling if Qt supports it (version 5.6 and beyond).
This is to prevent log files from ever exceeding a limit of 1MB each. Only the current and one other log file are kept, giving hopefully enough history for any neccessary debugging.
* Removed duplicate code of ipc event sending
* Removed duplicate code of profile loading
* Fixed bug where activating existing instance still started new instance of qtox asking to select a profile
* IPC messages are now profile-aware and are sent to instance that runs specified profile in -p flag or to ipc owner if -p is not specified.
If -p flag is specified ipc events will be send to instance which runs specified profile. If instance using that profile does not run - new qTox instance will be started. This works with password-protected profiles too - new instance will handle "uri" or "save" events after accepting user password.
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.
In particular, the Tox Projet does not own copyright over the qTox Project's
"qTox" collection of software, source code, and assets.
The qTox Project's assets are under the sole copyright of the qTox
contributors, and no partiular rights are granted to the Tox Project.
The qTox Project is not associated with the Tox Project in any ways, with the exception of "qTox" using the Tox Projet's "toxcore" collection of libraries.
In particular, the Tox Projet does not own copyright over the qTox Project's "qTox" collection of software, source code, and assets.
The qTox Project's assets are under the sole copyright of the qTox contributors, and no partiular rights are granted to the Tox Project.
Starting a new instance with the -p option will force it to start a new instance with the given profile instead of bringing an eventual existing instance to the foreground
Two instances can not run with the same profiles, the profile locking code will ensure that. A user who likes to live dangerously could manually delete the lock to force two instances on the same profile, but such an hypothetical user would be asking for it.
If a qTox instance starts and becomes owner of the IPC shared memory on its first try, it considers itself the only running freshly-started instance, and deletes any possibly stale lock before starting up. This should be fine in the vast majority of cases, but if an existing qTox instance freezes for a long enough time to lose ownership of the IPC and a new instance is started without first killing the frozen one, the frozen instance's lock will be deleted as stale by the new one. If the frozen instance subsequentely unfreezes, it will be running on a profile for which it doesn't have a lock, which could cause trouble. This is an intentionaly allowed edge case, the alternative being a stale lock staying forever until removed manually. A potential solution not yet implemented would be to check that the lock is still actually present before attempting any write.
