I use spaces to indent, but I sometimes need to type a tab character. For example, in Makefiles, or in tab-separated data files. So I have my indentation settings set to "indent with spaces", and I unchecked the "Tab key indents" box. But the Tab key still only inserts spaces.
Steps to Reproduce:
1. Make sure "Tab key indents" preference checkbox is unchecked.
2. Set indentation mode to Spaces (2 spaces)
3. Open a new document.
4. Press Tab.
5. Type some letters.
6. Press Tab again.
Pressing Tab key inserts a Tab character (both times).
Pressing Tab key inserts spaces that align with the tab stops.
Using Geany 0.19.1 on Linux.