It is inappropriate to abuse anybody contributing to any project no matter what their status in the project. An opinion is a personal position based on the contributors experience, just because that does not agree with your personal opinion is not an excuse for abuse.
If you had read my posts with less emotion you would have seen that they do __not__ say that the option should not be added, in fact I have pointed out the mechanism by which that has to happen, adding it to Scintilla first, and pointing out that will make it available when that version of Scintilla is imported.
type part of a VARIABLE NAME that you are creating.
Geany can't distinguish what type of name is being typed, it will show variables, functions, types, enumerations etc, anything with the same prefix. And if the autocomplete word option is on then the list will be all words in the document with the currently typed prefix. In my experience that tends to result in long lists. Your experience may differ.