I can confirm #2, however. If I have more text in the edit box than fits on the visible screen and I'm at the beginning of the line, I cannot highlight the text with the mouse and "scroll" to the end. It will only go to the end of the visible area.
I can confirm this too, on Win XP Pro SP2, with mIRC 6.35 as well as the prior versions. I took the freedom to borrow a sentence from the mIRC about page for reproduction steps.
- Use a single line editbox and paste the following into it:
mIRC is a full featured Internet Relay Chat client for Windows that can be used to communicate, share, play or work with others on IRC networks around the world, either in multi-user group conferences or in one-to-one private discussions.
- Press the Home key to get to the start of the line
- Try to highlight the text with the mouse from left to right. As soon as the end of the visible area is reached, you can't highlight any further because the text doesn't scroll.
Highlighting right to left works, albeit not smoothly. The text "jumps" to the start of the line as soon as you reach the left end of the visible area.