Put a few lines of text into a TMSFMXMemo. Go to anywhere above the last line. Hold down, or repeatedly press the right arrow key. As the cursor reaches the end of each line it advances to the next line, which is correct.
However, on the last line, when the cursor reaches the last character of the last line, the cursor is wrapping around to the first character of the last line. The proper behavior, as is done in all other editors, is for the cursor to simply stop moving when the right arrow is pressed and at the last character of the last line.
Note that the left arrow works properly. When the first character of the first line is reached, the cursor simply sits there when the left arrow is pressed.
Thanks for reporting. We traced & fixed this issue. The next update will address this.