Wintab32 (Patch 4 of 8) -- Expose more XInput events through the wintab api.

[Robert North]

This set of patches works towards better quality painting in Painter5.
Tested on Painter5 & Photoshop 6.

Changelog:

*WTEnable, when called to disable tablet context, clears context queue, 
as per wintab spec.

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Index: dlls/wintab32/context.c
===================================================================
--- dlls/wintab32/context.c	(revision 156)
+++ dlls/wintab32/context.c	(revision 157)
@@ -233,6 +233,14 @@
     return ptr;
 }
 
+/*
+ * Flushes all packets from the queue.
+ */
+static void inline TABLET_FlushQueue(LPOPENCONTEXT context)
+{
+    context->PacketsQueued = 0;
+}
+
 int static inline CopyTabletData(LPVOID target, LPVOID src, INT size)
 {
     memcpy(target,src,size);
@@ -584,6 +592,8 @@
 
     EnterCriticalSection(&csTablet);
     context = TABLET_FindOpenContext(hCtx);
+    if(!fEnable)
+        TABLET_FlushQueue(context);
     context->enabled = fEnable;
     LeaveCriticalSection(&csTablet);