Causality problems with rule systems.

[Heizelmann]

I have several problems with rules. Here is one of them:
Let's look at the following rule:

if $timerRemain gets updated and $timerRemain > 0 
    then set $timerRemain to ($timerRemain - 1) after 1s

1. $timerRemain is initially 0 or below
2. Now change it to a positve value. Nothing will happen
3. Change it again to different positiv value. Now the rule will fire and counts down the variable
4. $timerRemain reaches 0. The process doesn't stop as expected by the rule
5. $timerRemain reaches -1. The process stops one step to late.

Alternativ:
3. b) Change it back to a value <= 0. The rule fires once.

I conclude that the change of the variable $timerRemain triggers the rule before its value of $timerRemain is updated.

[sweetpi]

I will look into that problem. Seems indeed that the "gets updated" event fires to early.

[Heizelmann]

Might be solved, see http://forum.pimatic.org/topic/170/strange-behaviour-of-if-var-changes