Plotting from script and changing the code editor tabs would cause the last plot's line edit in the plotselector widget to steal focus temporarily. On losing the focus it would trigger the `QLineEdit::editingFinished slot which would call `plotselector.view.rename_plot`. This also happened on Workbench closing, which would then try to update the name from the plotselector widget that has been deleted, and would throw the exception.

Re #26305