I know that this use case seems to be very exotic, but it is *really* annoying for Addon vendors.
Steps to reproduce:
1. Create a custom Drawing Tool
2. Add the Drawing Tool Tile indicator to a chart
3. Activate the checkbox of the custom Drawing Tool in the "Drawing Tools" list of the Drawing Tool Tile indicator settings
4. Save the workspace
5. Copy the workspace to another computer. The other computer must have the same addon installed of course.
6. Load the workspace
Result: the Drawing Tool Tile does not show the custom Drawing Tool. However, if you open the indicator settings, you can see that the checkbox of the custom Drawing Tool is actually checked. The workspace seems to be fine, but the indicator cannot load custom Drawing Tools from an imported workspace.
However, if you uncheck the checkbox, press "apply", then activate the checkbox again and press "OK", then it works fine. Only the very first time when importing the workspace does not work. After that it always works.

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