saga merge vector layers do not works in QGIS3

[qgib]

Author Name: Antonio Viscomi (@Antoviscomi)
Original Redmine Issue: 18545
Affected QGIS version: master
Redmine category:processing/saga
Assignee: Victor Olaya

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Hi All,
I need to merge 14 vector layers then I tried to use saga merge vector layers to do It
when I run It, It came out with the below error log:

2018-03-26T16:35:54 CRITICAL Traceback (most recent call last):
File "C:/OSGEO41/apps/qgis/./python/plugins\processing\algs\saga\SagaAlgorithm.py", line 231, in processAlgorithm
temp_params = deepcopy(parameters)
File "C:\OSGEO41\apps\Python36\lib\copy.py", line 150, in deepcopy
y = copier(x, memo)
File "C:\OSGEO41\apps\Python36\lib\copy.py", line 240, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "C:\OSGEO41\apps\Python36\lib\copy.py", line 150, in deepcopy
y = copier(x, memo)
File "C:\OSGEO41\apps\Python36\lib\copy.py", line 215, in _deepcopy_list
append(deepcopy(a, memo))
File "C:\OSGEO41\apps\Python36\lib\copy.py", line 169, in deepcopy
rv = reductor(4)
TypeError: can't pickle QgsVectorLayer objects

in QGIS 2.18, it works fine with the same files an the same SAGA version 2.3.2

[qgib]

Author Name: Antonio Viscomi (@Antoviscomi)

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Sorry, I forgot to flag regression

[qgib]

Author Name: Salvatore Larosa (@slarosa)

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• regression was changed from 0 to 1
• version was changed from 3.0.0 to master

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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Applied in changeset b8ff44e.

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• done_ratio was changed from 0 to 100
• status_id was changed from Open to Closed