stacked-tree-width-ratio accesses the
, which is the ratio between the width of the root rectangle now and when the root was set.
The default action of the
Ctrl-r gesture is effectively the same as setting
stacked-tree-width-ratio to 1 and scrolling to the top left.
is not affected by changes in the width of the stacked-tree after the root has been set.
CAPI User Guide and Reference Manual (Windows version) - 3 Aug 2017