Windows tiling does not work (regression)

[grofaty]

I have downloaded Pinta 1.8 development for Ubuntu 20.04 from
https://github.com/PintaProject/Pinta/actions/runs/450000006

1. Open two images (or create two new ones).
2. In Pinta 1.7 you can click and hold on one of the image tabs and move it to the right site of Pinta program. This creates new window like tiling. In Pinta 1.8 this tiling does not work anymore, so regression from 1.7 version.

I am attaching print-screen from 1.7 version to demonstrate what window tiling is.

[Cameron White (cameronwhite91)]

There is some in-progress work on porting the docking functionality to GTK3 (https://github.com/PintaProject/Pinta/pull/148). Currently there is just a placeholder implementation with limited functionality.

[Cameron White (cameronwhite91)]

I'm going to remove this from the 1.8 milestone. Porting / replacing the old docking library for GTK3 is something to consider for future releases, but is too large of a scope for the 1.8 release (which is otherwise nearly ready)

[Cameron White (cameronwhite91)]

Also adding a note that we'd need to be careful about the theming issues from bug 1738106 if the old docking library is ported.

[Cameron White (cameronwhite91)]

The better approach in the future, if we want to go back to having more full-featured dock widgets, would be to use C# bindings for a library like libpanel (https://github.com/gircore/gir.core/issues/535) rather than maintaining our own docking library