Add API support for multiple clipboards

Adds a PuglClipboard enum, and uses it everywhere necessary to "structurally"
support multiple clipboards.  Towards re-using this API to support DnD.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/x11.h b/src/x11.h
index bc93630..58073e5 100644
--- a/src/x11.h
+++ b/src/x11.h
@@ -54,6 +54,7 @@ typedef struct {
 } PuglTimer;
 
 typedef struct {
+  PuglClipboard clipboard;
   Atom          selection;
   Atom          property;
   Window        source;