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Inner splitter / left pane
Resizable and collapsible.
Inner splitter / center pane
Resizable only.
Inner splitter / right pane
Resizable and collapsible.
Outer splitter / bottom pane
Non-resizable and non-collapsible.
Alt
w
focuses first splitbar
left arrow
moves focused splitbar to the left (if horizontal splitter)
right arrow
moves focused splitbar to the right (if horizontal splitter)
up arrow
moves focused splitbar up (if vertical splitter)
down arrow
moves focused splitbar down (if vertical splitter)
enter
accepts current position of the splitbar
esc
returns splitbar to its initial position
ctrl
left arrow
collapses the left pane or expands the right one
ctrl
right arrow
collapses the right pane or expands the left one
ctrl
down arrow
collapses the upper pane or expands the lower one
ctrl
up arrow
collapses the lower pane or expands the upper one