Index: base/shell/explorer-new/taskswnd.c
===================================================================
--- base/shell/explorer-new/taskswnd.c	(revision 58178)
+++ base/shell/explorer-new/taskswnd.c	(working copy)
@@ -1298,12 +1298,16 @@
 
             /* Determine the minimum and maximum width of a button */
             if (Horizontal)
+            {
                 uiMax = GetSystemMetrics(SM_CXMINIMIZED);
+                uiMin = GetSystemMetrics(SM_CXSIZE) + (2 * GetSystemMetrics(SM_CXEDGE));
+            }
             else
+            {
                 uiMax = rcClient.right;
+                uiMin = rcClient.right;
+            }
 
-            uiMin = GetSystemMetrics(SM_CXSIZE) + (2 * GetSystemMetrics(SM_CXEDGE));
-
             if (NewBtnSize < (LONG)uiMin)
                 NewBtnSize = uiMin;
             if (NewBtnSize > (LONG)uiMax)