This diff is to address the issue with creating brush presets from scratch.
https://phabricator.kde.org/T7380
This adds two things
- a + icon by the presets section in the brush editor. Holding the button down will allow you to select the default brush engine for any given engine.
- Added a delete button. We do not delete presets so this will blacklist the currently selected resource and update the presets list
For creating a new preset, I also added a bit of UI state management by hiding things like rename, reload, or overwriting. The state returns to normal once another preset is selected from the preset list