Fix #148 - Open documents into new tab rather than new window

[Mte90]

In this way if there is already ReText instance, the second one send the file to the other and kill himself.

[mitya57]

Some general comments:

• The window is briefly shown and then closed. I think the new code should be moved before window.show() line.

• We also support Windows, macOS and other platforms where D-Bus is not available. ReText should continue working on those platforms.

• I think some people would like to still be able to create multiple windows. Maybe add a command-line option to start a new window? (And ideally expose it in the .desktop file).

Otherwise thanks for your pull request!

[mitya57]

This also exports some slots on org.qtproject.Qt.QWidget interface that should not be exposed publicly. Like setWindowModified and setWindowTitle. Is there any way to avoid that?

[Mte90]

Right now is missing:

• I don't know how to add a new parameter to ReText, do you have any suggestion where is the code? I see that manually you are checking the sys.argv, but for new parameters is not a scalable way
• To expose only the method of ReTextWindow that are not part of QWindow we need to create a new QDbusAdapter with the list of all the methods. Maybe we can create a wrapper class that include only the ones that we really want.

[mitya57]

Thanks for your work! I am on a vacation now, will finish the implementation myself next week.

[Mte90]

No problem @mitya57 :-)

[mitya57]

Merged now, thank you!

[Mte90]

I didn't know of this class in Qt, my fault

[mitya57]

There is also Python's argparse module, but Qt's is better, as it supports passing some standard flags (like -style or -platform) to Qt.