When I add an entry to my API file with no parameters (such as a single word), if I type any of the parameter start characters after typing said word I get a calltip (which did not happen in releases at least up to 3.0.2), and what's more, it contains a repeated letter (such as 'tesst').
I've attached a screenshot.
Calltips and autocomplete were changed for bug #3517810.
Haven't been able to reproduce the repeated character. Could you upload a minimal API file that reproduces this along with the properties you are using with it?
I've added a patch to be applied to the wscite321.zip binary package. In order to reproduce the bug, open SciTE then type 'testone(' without the quotes. You'll see that it mistakenly displays a wrongly sized 'testonne' calltip (that should not appear at all). Then press ENTER, and type 'testtwo(' without the quotes. This time it will show a calltip that was supposed to be shown, and with the correct info.
Committed fix.