Today I continued the work on DxfLinePattern support in GUI. The ByBlock and ByLayer are now hidden by default and needs to be added manually, which add them in the first line of QComboBox menu.
A new entry allow to add a new DxfLinePattern, the creation dialog is not finished yet, it should be tomorrow.

I'll wait until drawing with line patterns is fully supported before adding options to select line pattern and color for individual entities. I'll continue the work on spline creation.