First of all, thank you for taking the time to contribute to this project.
Since WineConf 2015 Wine Staging is an official part of WineHQ, which means you can report problems directly at bugs.winehq.org. Most of the time bugs found in Wine Staging also turn out to be present in the development branch, so its recommended to open your bug in the "Wine" product, unless you are sure its really "Wine Staging" specific. For bugs related to our binary packages, please open a bug report in the "Packaging" product.
IMPORTANT: Please use dev.wine-staging.com for patch submissions, we currently do not accept Pull requests on GitHub.
Wine Staging mainly concentrates on experimental features and patches which are difficult to get into the development branch. If you have a very simple bug fix including tests, there is usually no need to send it to Wine Staging. You can directly contribute it to the development branch. However, if you already tried that without success, or are working on such a complex area that you do not really think its ready for inclusion, you might want to submit it to our Staging tree. Please open a patch submission request on dev.wine-staging.com including the patch. More information is also available in our Wiki.