For now, the lines of a xxx2Many widget that are deleted or removed, are just displayed with text-muted/not sensitive (and a strike through for deleted).
This is not always evident to users that the deletion or removal has been registered with the visual hint. But also that the action will actually happen only after saving.
The proposal is to add an ! with the warning context to show that something has happened to the line and to add a tooltip like “Pending deletion; will be removed on save.”.
The idea is that the char does not alter the alignement of the columns and does not add a new column.
But also to look similar to the “modified” hint on widgets.
That’s why it is the warning visual and not the error visual.
I do not think so because user may interpret that they need to click on the trash to delete.
The point is to show that the client has recorded the action and thus the line is modified. The kind of action is mainly optional.