Bug 3537519: convert case and NUL characters
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https://sourceforge.net/tracker/?func=detail&aid=3537519&group_id=95717&atid=612382
If you use convert case on a selection which has a NUL character in it, the selection will be truncated. The problem is that SCI_REPLACESEL expects a NULL terminated string. It can be fixed by using SCI_REPLACETARGET instead.
Multi-selection/column mode doesn't seem to work when there are NULs involved, so I don't think that case needs to change.
Fix for convert case and NUL characters