Get the horizontal spacing from a tree node to its label.
Returns
number
Horizontal pixel distance from a tree node start to its label,
including the arrow area and spacing.
Remarks
Horizontal distance before the label when using tree nodes or Bullet().
For a regular unframed tree node, this is
GetFontSize() + style.FramePaddingX * 2,
where style is the mapped view from ImGui.viewImGuiStyle(styleHandle).
Get the horizontal spacing from a tree node to its label.