Fix: restore storage of image colormaps in metadata and update item parameters in plot handling

Fix #138

Author: PierreRaybaut

CHANGELOG.md

@@ -16,6 +16,7 @@ See DataLab [roadmap page](https://datalab-platform.com/en/contributing/roadmap.
 
 🛠️ Bug fixes:
 
+* Fixed [Issue #138](https://github.com/DataLab-Platform/DataLab/issues/138) - Image colormaps were no longer stored in metadata (and serialized in HDF5 files) since PlotPy v2.6.3 (this commit, specifically: [PlotPyStack/PlotPy@a37af8a](https://github.com/PlotPyStack/PlotPy/commit/a37af8ae8392e5e3655e5c34b67a7cd1544ea845))
 * Fixed [Issue #137](https://github.com/DataLab-Platform/DataLab/issues/137) - Arithmetic operations and signal interpolation: dialog box with parameters is not displayed
 * Fixed [Issue #136](https://github.com/DataLab-Platform/DataLab/issues/136) - When processing a signal or an image, the analysis result is kept from original object
   * Before this fix, when processing a signal or an image (e.g. when applying a filter, a threshold, etc.), the analysis result was kept from the original object, and was not updated with the new data. Thus the analysis result was not meaningful anymore, and was misleading the user.

cdl/core/gui/panel/base.py

@@ -312,6 +312,9 @@ def plot_item_parameters_changed(
         # Find the object corresponding to the plot item
         obj = self.plothandler.get_obj_from_item(item)
         if obj is not None:
+            # Ensure that item's parameters are up-to-date:
+            item.param.update_param(item)
+            # Update object metadata from plot item parameters
             obj.update_metadata_from_plot_item(item)
             if obj is self.objview.get_current_object():
                 self.objprop.update_properties_from(obj)