Hello everyone,
I am sending my Week 1 report (June 6 - June 13), more detailed version can be found in the project wiki: https://trac.osgeo.org/grass/wiki/GSoC/2021/SingleWindowLayout#Week1.
What did I complete during the first week?
- I started to develop Single-Window GUI in the prepared parallel environment. I arranged basic widgets (Data Catalog, Display, Modules, Console, Python), you can have a look at this PR: https://github.com/OSGeo/grass/pull/1621. After a discussion with mentors and other members of the GRASS community, it was decided to use Map Display as the center content pane. At the same time, we decided to use the python wx.lib.agw.aui library for Single-Window GUI development. This library contains a bunch of interesting functions as e.g. grouping dockable panes into notebooks. The picture of the current Single-Window layout state can be seen on the project wiki.
- At the same time, I also fixed a bug https://github.com/OSGeo/grass/issues/1636 (https://github.com/OSGeo/grass/pull/1637).
What am I going to achieve for next week?
- Implement a Map Display as a wx.Panel (now it is only in the form of wx.Frame) and integrate this Map Display as a center content pane.
Is there any blocking issue?
No, it is not.
Any suggestions are welcome. 
Best wishes,
Linda Kladivova