* tests/listbox.test: Added a test to check that the topIndex is

update when items are removed from the listvar variable.

* generic/tkListbox.c: Added a check the updates the topIndex when
items are removed from the listvar variable.


FossilOrigin-Name: 81be7b942d8f0551a240b0c61612819b5258c260

1 files changed, 20 insertions, 1 deletions

diff --git a/tests/listbox.test b/tests/listbox.test
index 3a20c07..886dfe1 100644
--- a/tests/listbox.test
+++ b/tests/listbox.test
@@ -6,7 +6,7 @@
 # Copyright (c) 1998-1999 by Scriptics Corporation.
 # All rights reserved.
 #
-# RCS: @(#) $Id: listbox.test,v 1.10 1999/11/24 00:20:14 ericm Exp $
+# RCS: @(#) $Id: listbox.test,v 1.11 1999/11/24 01:09:08 ericm Exp $
 
 if {[lsearch [namespace children] ::tcltest] == -1} {
     source [file join [pwd] [file dirname [info script]] defs.tcl]
@@ -1896,6 +1896,25 @@ test listbox-21.15 {ListboxListVarProc, update vertical scrollbar} {
     update
     set log
 } [list {y 0 1} {y 0 0.5}]
+test listbox-21.16 {ListboxListVarProc, update vertical scrollbar} {
+    catch {destroy .l}
+    catch {unset x}
+    listbox .l -listvar x -height 3
+    pack .l
+    update
+    set x [list 0 1 2 3 4 5]
+    .l yview scroll 3 units
+    update
+    set result {}
+    lappend result [.l yview]
+    set x [lreplace $x 3 3]
+    set x [lreplace $x 3 3]
+    set x [lreplace $x 3 3]
+    update
+    lappend result [.l yview]
+    set result
+} [list {0.5 1} {0 1}]
+
 # UpdateHScrollbar
 test listbox-22.1 {UpdateHScrollbar} {
     catch {destroy .l}