4 strange questions about RichTextBox

[Eduardo-]

◆ Problem 2:
RichTextBox SelStart, SelLength and SelText are sometimes incorrect.

I experienced that.
There are sometimes hidden or special characters, and when you try to change the .SelStart (rtb.SelStart = rtb.SelStart + 1) it remains in the same value, until you advance enough characters at once.

Whether it is a bug or a feature I don't know, but it cause problems.