Add dedicated "minimal" mode for templates #1754
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If an attribute is a link, when checking whether its value is the default value, only the resolved value should be compared with the default one. Otherwise, the attribute's "isDefault" property will always evaluate to True, even when a non-default link has been provided. This issue was especially evident with input File attributes, for which the default value is generally '' (empty string); if a link was set as a value (thus non-empty), its unresolved value would still be '', thus setting the "isDefault" property to True.
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Add a specific option to save a graph as a template ("Save As
Template") in "minimal" mode.
This mode only saves, for each node in the graph, the input and
output attributes whose values differ from the default ones. Any
attribute that is not serialized in the saved template file is
assumed to have its default value.
If a conflict is detected on a node when opening the template
file, it is logged but solved automatically.
The goal of this minimal mode is to prevent template files from
needing an update every single time a modification (may it be
minor or major) is done on a node description. Templates can
thus follow node changes and still be usable.
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fabiencastan
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Description
Following #1727, project files can be used as templates, with the .mg files containing the entire description of the graph. This implies that if there is a single node whose description is modified (parameters added, parameters removed, etc.), description conflicts will arise when opening a template containing such a node. For these conflicts to be resolved, the template would need to be saved again with the upgraded version of the node every single time there is a change, which defeats the purpose of having templates.
This PR adds a "minimal" mode to save and load templates. Instead of saving the entire graph description, the minimal mode only saves the modified input/output parameters. When that template is opened, conflicts are detected only on the saved parameters (with non-default values) and automatically solved. This makes templates robust to changes in node descriptions.
Features list
Implementation remarks