ALT-d for dashed lines, ALT-o for dotted lines, ALT-q for dash/dotted lines, ALT-s for solid line. Pressing the shortcut keys does not change the tool or its color. It just changes the line style.
For installation in windows:
- Unzip the following zip file into “Program Files/Xournal++/share/xournalapp/plugins”, and restart xournal++
- Plugin -> Plugin Manager: Enable Penstrokes plugin.
- Restart xournal++