[gadamopoulos] 74234: [UXTHEME] -Fix drawing the themed scrollbar. CORE-12933

Author: gadamopoulos
Date: Mon Mar 27 19:56:36 2017
New Revision: 74234

URL: http://svn.reactos.org/svn/reactos?rev=74234&view=rev
Log:
[UXTHEME] -Fix drawing the themed scrollbar. CORE-12933

Modified:
    trunk/reactos/dll/win32/uxtheme/ncscrollbar.c

Modified: trunk/reactos/dll/win32/uxtheme/ncscrollbar.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/dll/win32/uxtheme/ncscroll…
==============================================================================
--- trunk/reactos/dll/win32/uxtheme/ncscrollbar.c	[iso-8859-1] (original)
+++ trunk/reactos/dll/win32/uxtheme/ncscrollbar.c	[iso-8859-1] Mon Mar 27 19:56:36 2017
@@ -182,14 +182,18 @@
 {
     RECT r, rcPart;
 
+    /* thumbPos is relative to the edge of the scrollbar */
+
     r = psbi->rcScrollBar;
     if (vertical)
     {
+        thumbPos += pcontext->wi.rcClient.top - pcontext->wi.rcWindow.top;
         r.top    += psbi->dxyLineButton;
         r.bottom -= (psbi->dxyLineButton);
     }
     else
     {
+        thumbPos += pcontext->wi.rcClient.left - pcontext->wi.rcWindow.left;
         r.left  += psbi->dxyLineButton;
         r.right -= psbi->dxyLineButton;
     }