When I try to paste text into a text area using the middle mouse button, the text sometimes ends up in random places. I don't know the exact conditions under which this happens, but it is reproducible for the site where it happens (unfortunately, this form has no place to attach HTML). In the case where it occurs, the HTML that creates the TEXTAREA already places several pages of text into it. It looks to me like the paste happens at the "screen offset" of where the mouse was pressed without taking into account all the other text that has scrolled off.

Related to this, the mouse doesn't seem to behave as it should in text areas. This may be a more general problem or it may be related to this (or both). Clicking somewhere in the text sometimes scrolls up by several pages (this seems closely related). Clicking beyond (rather than near) the end of a line or beyond the end of the text does not set the pointer to the end of the line or to the end of the text.

The same problem occurs also when cutting/pasting with the Edit menu.

-The middle click to paste changes insertion point as well, and is bug 48786. -The "click beyond last line in editor" not working is fixed in current builds. If you feel there are more issues, please file separate bugs. Remember to always include build ID in bug-reports. Resolving as dup of bug 48786. *** This bug has been marked as a duplicate of 48786 ***

Found it: The selection bug you see was fixed on June 25th: bug 87133

verifying duplicate