Visual mode: when changing height of a triangular sector all vertices of which...

Visual mode: when changing height of a triangular sector all vertices of which have height offset, vertex heights will be changed instead of sector's floor/ceiling height (this allows to edit terrain without the use of vertex handles).
Visual mode: "Copy Texture", "Copy Texture Offsets" and "Copy Properties" actions now always copy properties from currently highlighted surface (previously they copied properties from the first selected surface when something was selected).
Draw Rectangle mode: nothing was drawn in some cases.
Drag Things mode: grid was not updated when grid size was changed in this mode.