RegionTimeSeriesImporter cannot remember sample rate of TimeSeries EEG MAT data

[PC-DOS]

Describe the bug

When uploading EEG MAT data to a project, the sampling rate specified in "sampling rate (Hz)" field cannot be remembered, and fallbacks to 1.0s.

Steps to reproduce

1. In project data structure viewer, open an upload window, and select "TimeSeries EEG MAT" tab
2. Select a MAT-formatted data file, and set "sampling rate (Hz)" to 500
3. Input other information
4. Upload
5. In project data structure viewer, click on the uploaded file
6. The "DataTypeDetails" window says the Sample Period is 1.0 (s)

Expected results

The "DataTypeDetails" window should say the Sample Period is 0.002 (s)

Actual results

The "DataTypeDetails" window says the Sample Period is 1.0 (s)

Additional information

After checking the source code, I found the launch() function, defined in RegionTimeSeriesImporter class, did not register the sampling_rate property of view_model to the ts object. While the start_time property is registered.

I modified the launch() function, added 1 new line like the following code:

            ts.start_time = view_model.start_time
            ts.sample_period_unit = 's'
            
            # Added by Picsell Dois
            # Fix a problem which prevents the uploader from remembering sampling rate
            ts.sample_period = 1.0 / view_model.sampling_rate
            # EndOf: Added by Picsell Dois

After relaunching TVB, the sample rate can be remembered properly: