All text is not pasted into richtextbox. Cut off in a certain place. How to fix it?

Question

C++ / C#

Hello, tell me how to make all the text from the buffer fit into the richtextbox. I insert text - out of 20 thousand lines, 5542 were inserted and the last line was cut off in half. How to fix it?

Answer 1

https://docs.microsoft.com/en-us/dotnet/api/system...