Support 'vertical' Workspace warping

'Vertical' Workspace warping is a variant of the existing Workspace
warping feature: When a user drags a window to the edge of the Screen,
the window is warped to the next / previous workspace.

'Vertical' Workspace warping detects a drag towards the upper / lower
border of the screen and warps the current workspace about an 'offset'.
Example given, lets say the user has 9 workspaces and considers them to
form a 3x3 grid:

  +-+-+-+
  |1|2|3|
  +-+-+-+
  |4|5|6|
  +-+-+-+
  |7|8|9|
  +-+-+-+

An 'offset' of 3 warps from workspaces 2 to workspace 5 (or 8), when a
window is dragged to the bottom / top border.

New configuration ressources:

    session.screenN.workspacewarpingvertical: true
    session.screenN.workspacewarpingverticaloffset: X

1 files changed, 2 insertions, 0 deletions

diff --git a/src/ScreenResource.cc b/src/ScreenResource.cc
index dbf532b..c188648 100644
--- a/src/ScreenResource.cc
+++ b/src/ScreenResource.cc
@@ -88,6 +88,8 @@ ScreenResource::ScreenResource(FbTk::ResourceManager& rm,
     max_disable_move(rm, false, scrname+".maxDisableMove", altscrname+".MaxDisableMove"),
     max_disable_resize(rm, false, scrname+".maxDisableResize", altscrname+".MaxDisableResize"),
     workspace_warping(rm, true, scrname+".workspacewarping", altscrname+".WorkspaceWarping"),
+    workspace_warping_vertical(rm, true, scrname+".workspacewarpingvertical", altscrname+".WorkspaceWarpingVertical"),
+    workspace_warping_vertical_offset(rm, 1, scrname+".workspacewarpingverticaloffset", altscrname+".WorkspaceWarpingVerticalOffset"),
     show_window_pos(rm, false, scrname+".showwindowposition", altscrname+".ShowWindowPosition"),
     auto_raise(rm, true, scrname+".autoRaise", altscrname+".AutoRaise"),
     click_raises(rm, true, scrname+".clickRaises", altscrname+".ClickRaises"),