Error in reloading experiments containing a permanent display

[Aya-Badawy89]

Describe the bug Changing the parameter value and reloading the experiment throws an error. Also, the charts view disappears when you switch between tabs after reloading the experiment.

To Reproduce 1) Please, copy the attached code on GAMA. 2) Open the simulation view and change the parameter (para) to any value 3) Reload the experiment 4) Run the simulation 5) Notice the error

Attached code:

model dummyModel

global {
    init {
        create person;
    }
    int para <- 2;
    bool end <- false;
}
species person {
    reflex behave {
        write 'time= ' + time color:#red;
        para <- para + 3;
        if (para > 14) {end <- true;}
    }   
}
experiment multi type: gui  {
    parameter 'para' var:para;
    list values;

    reflex when:  (end = true) {
        ask simulation {myself.values << para;}     
    }
    permanent {
        display first_display {
            chart 'Chart1' type:histogram 
            x_label: 'x'
            y_label: 'y'  {
                datalist legend:['para'] value:[para];          
            }   
        }
        display second_display {
            chart 'Chart2' type:histogram 
            x_label: 'x'
            y_label: 'y' {
                datalist legend:['para'] value:[para];          
            }   
        }
    }
}

Expected behavior The simulation should run without errors. I tried it on GAMA 1.8.1, and it worked fine.

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: Windows 10
• GAMA version: Gama 1.8.2 with JDK (latest release and earlier ones)

Additional context Add any other context about the problem here.

[hqnghi88]

Hi, I think it is a problem of permanent display, just try with other model in library where it has permanent block, then the experiment will throw error when reloaded (no need to change param or reflex...)

[Aya-Badawy89]

Where to test the fix? It does not work on the latest release 29/11

[hqnghi88]

Did you find it, the 1.8.2 alpha here https://github.com/gama-platform/gama/releases/tag/1.8.2 It seems ok for me.

[Aya-Badawy89]

I tested the fix and it works now. Thank you very much. I will close this issue.