if ( majorSizes[n] != wxDefaultCoord )
continue;
- const wxCoord
- minMajor = GetSizeInMajorDir(item->GetMinSizeWithBorder());
+ wxCoord minMajor = GetSizeInMajorDir(item->GetMinSizeWithBorder());
+
+ // it doesn't make sense for min size to be negative but right now
+ // it's possible to create e.g. a spacer with (-1, 10) as size and
+ // people do it in their code apparently (see #11842) so ensure
+ // that we don't use this -1 as real min size as it conflicts with
+ // the meaning we use for it here and negative min sizes just don't
+ // make sense anyhow (which is why it might be a better idea to
+ // deal with them at wxSizerItem level in the future but for now
+ // this is the minimal fix for the bug)
+ if ( minMajor < 0 )
+ minMajor = 0;
+
const int propItem = item->GetProportion();
if ( propItem )
{