Changed GtkTreeView to bookkeep the deepest expanded depth instead of recalculating it at column allocation time.
Changed GtkTreeView to bookkeep the deepest expanded depth instead of recalculating it at column allocation time.

grubersjoe/adwaita,jigpu/gtk,jadahl/gtk,grubersjoe/adwaita,davidgumberg/gtk,jessevdk/gtk,Adamovskiy/gtk,jessevdk/gtk,davidt/gtk,Adamovskiy/gtk,ahodesuka/gtk,chergert/gtk,jigpu/gtk,bratsche/gtk-,simokivimaki/gtk,alexlarsson/gtk,grubersjoe/adwaita,Lyude/gtk-,grubersjoe/adwaita,Adamovskiy/gtk,bratsche/gtk-,Sidnioulz/SandboxGtk,chergert/gtk,Adamovskiy/gtk,jessevdk/gtk,ebassi/gtk,simokivimaki/gtk,Distrotech/gtk2,ahodesuka/gtk,davidgumberg/gtk,Distrotech/gtk2,Distrotech/gtk2,davidgumberg/gtk,simokivimaki/gtk,simokivimaki/gtk,jigpu/gtk,chergert/gtk,ahodesuka/gtk,bratsche/gtk-,ahodesuka/gtk,grubersjoe/adwaita,alexlarsson/gtk,jessevdk/gtk,davidgumberg/gtk,davidt/gtk,ahodesuka/gtk,ebassi/gtk,jadahl/gtk,ebassi/gtk,jadahl/gtk,msteinert/gtk,jessevdk/gtk,alexlarsson/gtk,jessevdk/gtk,Lyude/gtk-,jadahl/gtk,Sidnioulz/SandboxGtk,davidgumberg/gtk,chergert/gtk,grubersjoe/adwaita,ahodesuka/gtk,alexlarsson/gtk,davidt/gtk,davidt/gtk,jessevdk/gtk,davidt/gtk,alexlarsson/gtk,msteinert/gtk,jadahl/gtk,ahodesuka/gtk,grubersjoe/adwaita,jigpu/gtk,jadahl/gtk,davidt/gtk,Lyude/gtk-,Lyude/gtk-,simokivimaki/gtk,chergert/gtk,davidgumberg/gtk,chergert/gtk,ahodesuka/gtk,Sidnioulz/SandboxGtk,jadahl/gtk,ebassi/gtk,alexlarsson/gtk,msteinert/gtk,ebassi/gtk,Lyude/gtk-,simokivimaki/gtk,Sidnioulz/SandboxGtk,Distrotech/gtk2,Sidnioulz/SandboxGtk,Sidnioulz/SandboxGtk,msteinert/gtk,Lyude/gtk-,ebassi/gtk,Adamovskiy/gtk,davidgumberg/gtk,bratsche/gtk-,chergert/gtk,Adamovskiy/gtk,jigpu/gtk,grubersjoe/adwaita,Lyude/gtk-,Adamovskiy/gtk,msteinert/gtk,Adamovskiy/gtk,Distrotech/gtk2,jigpu/gtk,msteinert/gtk,alexlarsson/gtk,davidgumberg/gtk,alexlarsson/gtk,bratsche/gtk-,bratsche/gtk-,Lyude/gtk-,jigpu/gtk,jigpu/gtk,Distrotech/gtk2,chergert/gtk,jadahl/gtk