Plugin does not always recognize boolean fields

[boychev]

I have some boolean fields whose getters are generated by IDEA's default template and whose names start with is instead of get. When generating a builder with the options Inner builder, 'but' method, and Use single field all enabled, the plugin does not show those fields in the field-selection dialog.

The plugin shows those fields in the field-selection dialog if I disable the option 'but' method, while still having the other two options enabled. My plugin version is 1.1.7.