/usr/share/kdevcodegen/templates/class_property_setter_definition_cpp.txt is in kdevelop-data 4:5.2.1-1ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | {% load kdev_filters %}
void {{ name }}::set{{ property.name|upper_first }}({{ property.type|arg_type }} {{ property.name }})
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