This is pure semantics, but I stated

Quote Originally Posted by Asperamanca View Post
SOURCE and HEADER variables (and possibly others, too) seem to remember the values of past executions of qmake.
(there was more, but this is the core of the statement)

...to which you replied...

Quote Originally Posted by wysota View Post
No, that's impossible
If (as I now know) there is a mechanism to pre-define those values for all projects (using qconfig.pri), then my statement is basically correct: The value of the SOURCES variable can be remembered across multiple project, machine reboots, etc.
Of course the description is misleading, since I did not (at that time) know the cause for this behaviour, and thus used the term "remembering", which is inaccurate.

Please consider also that I did not plainly say this is a bug, instead I asked whether this would be considered a bug, or expected behaviour (which, as it turns out, it is).

No blame was assigned to anyone, and I probably will not be able to find out how exactly the filenames ended up in qconfig.pri (I only know for sure that I never manually wrote anything in there).

EDIT:
As for IDE...I'm using QTCreator, which (right now) seems to be the most likely cause.