Bug 482490

Cross-channel color adjustment filter could not be configured by script. When such a filter is created by code, its configuration property is initialized to {'nTransfers': 0}. However, a normal color adjustment filter created by GUI dialog has configuration properties like  {'curve0': '0,0.5;1,0.5;', 'curve1': '0,0.5;1,0.5;', 'curve2': '0,0.5;1,0.5;', 'curve3': '0,0.5;1,0.5;', 'curve4': '0,0;1,0.5;', 'curve5': '0,0.5;1,0.5;', 'curve6': '0,0.5;1,0.5;', 'curve7': '0,0.5;1,0.5;', 'nTransfers': 8}. Then, I tried to add these cruve information to the initial empty configuration created by script. However, the code didn't work as expected, that the cruve 0-7 is added to filter configuration while property 'nTransfers' always remains 0. (fig.1)

According to the source code (fig.2), property 'nTransfers' should change with the curve infomation added, but it didn't work. Furthermore，the curve infomation is also ignored, the filter created by the script didn't work as the curve info I specified.

Moreover, the curve 0-7 only specify the mapping curve for 8 output channels. However, the driver channel is not specified by the filter configuration, which means that dirver channel infomation could not be accessed by script.(fig.3)

Similar problem with other colour adjustment filter: https://krita-artists.org/t/scripting-with-colour-adjustment-filter-layer/23229