[QGIS-Developer] QGIS3 Processing Modeler - some bugs encountered

[kimaidou]

Dear devs,

I am looking at Processing for QGIS3, and would like to share some bugs I
discovered while playing with models. I have not found related issues in
the hub. I will add them after some feedback. Please point me the the
issues if they do exists in Redmine

* Number input is not proposed in algorithms. For example, after adding an
input of type Number, you cannot anymore use this input as a value for the
buffer size in the QGIS fixed buffer alg : no combobox is shown to the
user, just a standard text input.

* Grid alg : the user can choose the extent of one of the vector layers (
inputs or results of alg), bug when you run the model, the extent is empty
and the grid alg failed.

Regards,
Michaël
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