convert SdrLayerId to strong_int

Also
- rename SetOfByte to SdrLayerIDSet
- add asserts in SdrLayerAdmin::GetUniqueLayerID so that we don't
allocate overlapping SdrLayerID values
- add a new constant SDRLAYERPOS_NOTFOUND to be returned from
SdrLayerAdmin::GetLayerPos

Change-Id: I3bb3489f9338e3d02c4040bcbd811744699941c8
Reviewed-on: https://gerrit.libreoffice.org/37467
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/svx/svdviter.hxx b/include/svx/svdviter.hxx
index 7f903c440c73..76d0ca49662c 100644
--- a/include/svx/svdviter.hxx
+++ b/include/svx/svdviter.hxx
@@ -59,7 +59,7 @@ class SdrPageView;
 class SdrModel;
 class SdrPage;
 class SdrObject;
-class SetOfByte;
+class SdrLayerIDSet;
 
 class SVX_DLLPUBLIC SdrViewIter
 {