Sketcher ConstrainVertical/sv

Description
Creates a vertical constraint to the selected lines or polyline elements. Starting with v0.17, it can also contrain vertices vertically. More than one object can be selected.

How to use

 * 1) Select the lines or vertices to be constrained vertically
 * 2) Press the  vertical constraint icon.
 * 3) Alternatively, the tool can be started without prior selection, and it will expect a selection; but only lines will be selectable.
 * 4) Right-click or press  once to exit the tool.