Import Tk 8.6.8

tests/ttk/combobox.test

@@ -45,6 +45,15 @@ test combobox-2.4 "current -- value not in list" -body {
 
 test combobox-2.end "Cleanup" -body { destroy .cb }
 
+test combobox-3 "Read postoffset value dynamically from current style" -body {
+    ttk::combobox .cb -values [list a b c] -style "DerivedStyle.TCombobox"
+    pack .cb -expand true -fill both 
+    ttk::style configure DerivedStyle.TCombobox -postoffset [list 25 0 0 0]
+    ttk::combobox::Post .cb
+    expr {[winfo rootx .cb.popdown] - [winfo rootx .cb]}
+} -result 25 -cleanup {
+    destroy .cb
+}
 
 test combobox-1890211 "ComboboxSelected event after listbox unposted" -body {
     # whitebox test...