Index: group.c
===================================================================
--- group.c     (revision 1583)
+++ group.c     (working copy)
@@ -312,6 +312,8 @@
        CompWindow *w;
        for (w = s->windows; w; w = w->next) {
                if ((gs->wMask & w->type) &&
+                   ( !(w->wmType & CompWindowTypeDockMask) || gs->wMask & CompWindowTypeDockMask ) &&
+                   ( !(w->wmType & CompWindowTypeDesktopMask) || gs->wMask & CompWindowTypeDesktopMask ) &&
                    !w->invisible &&
                    TOLRNC_MIN(reg.extents.x1, WIN_X(w), tolerance * WIN_WIDTH(w)) &&
                    TOLRNC_MIN(reg.extents.y1, WIN_Y(w), tolerance * WIN_HEIGHT(w)) &&
@@ -435,8 +437,8 @@
                gw->orgPosX = WIN_X(cw);
                gw->orgPosY = WIN_Y(cw);
                // center the window to the main window
-               gw->destinationX = WIN_X(main) + (WIN_WIDTH(main) / 2) - (WIN_WIDTH(cw) / 2);
-               gw->destinationY = WIN_Y(main) + (WIN_HEIGHT(main) / 2) - (WIN_HEIGHT(cw) / 2);
+               gw->destinationX = WIN_X(main) + ((WIN_WIDTH(main) - WIN_WIDTH(cw) ) >> 1 );
+               gw->destinationY = WIN_Y(main) + ((WIN_HEIGHT(main) - WIN_HEIGHT(cw) ) >> 1 );
                gw->animate = TRUE;
        }

@@ -1020,10 +1022,14 @@
        GROUP_DISPLAY(d);
        GROUP_SCREEN(w->screen);
        GROUP_WINDOW(w);
-
+
+       if ( w->invisible || !( gs->wMask & w->type &&
+            ( !(w->wmType & CompWindowTypeDockMask) || gs->wMask & CompWindowTypeDockMask ) &&
+            ( !(w->wmType & CompWindowTypeDesktopMask) || gs->wMask & CompWindowTypeDesktopMask ) ) )
+               return;
+
        // select singe window
-       if ((gs->wMask & w->type) &&
-           !w->invisible && !gw->inSelection && !gw->inGroup) {
+       if (!gw->inSelection && !gw->inGroup) {

                groupAddWindowToSelection(d, w);

@@ -1031,16 +1037,14 @@
                addWindowDamage(w);
        }
        // unselect single window
-       else if ((gs->wMask & w->type) &&
-                !w->invisible && gw->inSelection && !gw->inGroup) {
+       else if (gw->inSelection && !gw->inGroup) {

                groupDeleteSelectionWindow(d, w);
                gw->inSelection = FALSE;
                addWindowDamage(w);
        }
        // select group
-       else if ((gs->wMask & w->type) &&
-                !w->invisible && !gw->inSelection && gw->inGroup) {
+       else if (!gw->inSelection && gw->inGroup) {

                int index = groupFindGroupAtDisplay(gd, gw->groupID);
                if (index == -1)
@@ -1058,8 +1062,7 @@
                }
        }
        // Unselect group
-       else if ((gs->wMask & w->type) &&
-                !w->invisible && gw->inSelection && gw->inGroup) {
+       else if (gw->inSelection && gw->inGroup) {
                int index = groupFindGroupAtDisplay(gd, gw->groupID);
                if (index == -1)
                        return;
@@ -1859,7 +1862,7 @@
        int x1, x2, y1, y2, width, height;
        width  = BORDER_WIDTH * (group->nWins + 1) + THUMB_SIZE * group->nWins;
        height = BORDER_WIDTH * 2 + THUMB_SIZE;
-       x1 = WIN_X(group->topTab) + WIN_WIDTH(group->topTab) / 2 - width / 2;
+       x1 = WIN_X(group->topTab) + ((WIN_WIDTH(group->topTab) - width ) >> 1 );
        y1 = WIN_Y(group->topTab) + 10;
        x2 = x1 + width;
        y2 = y1 + height;