I hate when it decides you are trying to drag text.

Autocompletion(for jumping to a list entry) is also wonky--it doesn't seem to reset based on your last keystroke, but a certain time after you started typing. It often resets in the middle of typing.

When you press up to get your last text input it puts the caret at the beginning of the text rather than the end.

In multiline text when new text is added(like in RC chat) that exceeds the horizontal window, it sets the scroll focus to the right edge, forcing you to have to scroll back to the left.

That's all I can think of off the top of my head, or at least GUI issues I have with the current RC.