fix #19820: error after grow/shrink selection
requested to merge utkarsh.ayachit/paraview:19820-error-message-unexpected-call-to-selectionchanged into master
fixes error message after grow/shrink selection. An observer was incorrectly getting adding due to missing switch case. Fixed
Closes #19820 (closed)
Backport: release
Edited by Utkarsh Ayachit