#2294 SCI_AUTOCSHOW crashes on empty itemList with SC_ORDER_CUSTOM (Windows)

[Kered13]

Reproduction on Windows:

1. Call SCI_AUTOCSETORDER with SC_ORDER_CUSTOM
2. Call SCI_AUTOCSHOW with an empty string for the itemList.

The crash is caused by an assert in AutoCompletion.cxx. The root cause is that ListBoxX::SetList inserts a single empty element when given the empty string, but Sorter does not, and this mismatch trips the assert.

While calling SCI_AUTOCSHOW with an empty list doesn't really make much sense (and I only discovered this on accident due to a bug in my code), Scintilla should not crash in this case.

[Neil Hodgson]

This is just an assertion so won't show in release builds.

Committed [6d1bb4] that adds an item to Sorter when the list is empty.

[Neil Hodgson]

This is just an assertion so won't show in release builds.

Committed [6d1bb4] that adds an item to Sorter when the list is empty.