func (hds *Heads) SwitchWorkspaces(wk1, wk2 *workspace.Workspace) {
v1, v2 := hds.VisibleIndex(wk1), hds.VisibleIndex(wk2)
switch {
case v1 > -1 && v2 > -1:
wk1.Hide()
wk2.Hide()
hds.visibles[v1], hds.visibles[v2] = hds.visibles[v2], hds.visibles[v1]
wk1.Show()
wk2.Show()
case v1 > -1 && v2 == -1:
wk1.Hide()
hds.visibles[v1] = wk2
wk2.Show()
case v1 == -1 && v2 > -1:
wk2.Hide()
hds.visibles[v2] = wk1
wk1.Show()
case v1 == -1 && v2 == -1:
// Meaningless
default:
panic("unreachable")
}
}
