EDIT

ref #7095 Enforce visual refresh when toggling list and tree view

ref #7095 Fix order of UI elements

ref #7095 Code cleanup

ref #7095 Refactor character matrix

• split e4 part and nattable widgets in two classes

ref #7095 Refactor freeze columns functionality

• switch lock icon when freezing

fix #7237: add empty entry in combobox and delete distribution if selected in distribution editor

ref #7095, #7086 Check classification uniqueness of sub tree filter

• fix imports

ref #7095 Fix imports

ref #7095 Freeze/stick supplemental info columns

• Add button for unfreezing

ref #7095 use model method for setting state data