Check that item ID is initialized when inserting it in wxListCtrl.

Using uninitialized ID happened to work by accident with 2.8 but it doesn't
work any more, try to detect this as early as possible and give a clear
explanation of why it doesn't to help fixing the broken code that used to
accidentally work.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71381 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/src/msw/listctrl.cpp b/src/msw/listctrl.cpp
index 8d0bead33322e74eb0fdfe37d8e76e9bdef60782..3c3e797059c39eaabeffe36b91f82f187725035c 100644 (file)
--- a/src/msw/listctrl.cpp
+++ b/src/msw/listctrl.cpp
@@ -1656,6 +1656,12 @@ long wxListCtrl::InsertItem(const wxListItem& info)
 {
     wxASSERT_MSG( !IsVirtual(), wxT("can't be used with virtual controls") );
 
+    // In 2.8 it was possible to succeed inserting an item without initializing
+    // its ID as it defaulted to 0. This was however never supported and in 2.9
+    // the ID is -1 by default and inserting it simply fails, but it might be
+    // not obvious why does it happen, so check it proactively.
+    wxASSERT_MSG( info.m_itemId != -1, wxS("Item ID must be set.") );
+
     LV_ITEM item;
     wxConvertToMSWListItem(this, info, item);
     item.mask &= ~LVIF_PARAM;