unchecking games during scan yields strange behavior

[catharsis71]

when you uncheck a game during a scan, it appears to continue scanning for additional matches for that game, however, any matches found during this period will not appear if the game is later checked back on, only matches found prior to the initial unchecking will (re)appear, as well as matches found after checking the game back on. matches found while the game was unchecked appear to exist invisibly, and evidence of this can be found when using the "Offer a trade for all" button.

for example:

1. start scan
2. get match for game A
3. uncheck game A
4. wait for invisible matches of game A to happen
5. check game A back on (older matches will reappear but not the invisible matches that happened while game A was unchecked)
6. click "Offer a trade for all" on a user that has a visible match for game B and invisible match for game A
7. the trade window will incorporate cards for both game A and game B