882149 - Coordinates near text area boundaries and line endings passed to caretPositionFromPoint produce wrong offsets

Status: NEW

(Core :: DOM: Core & HTML, defect, P5)

Description

[Jim Mathies [:jimm]]

Spun off from bug 865654:

(In reply to Scott Johnson (:jwir3) from comment #13)
> (In reply to Jim Mathies [:jimm] from comment #12)
> > (In reply to Scott Johnson (:jwir3) from comment #11)
> > > (In reply to Jim Mathies [:jimm] from comment #10)
> > > > Created attachment 761418 [details]
> > > > textarea
> > > > 
> > > > This is still a little broken with text area boundaries, should I file a
> > > > follow up?
> > > 
> > > Jim:
> > > 
> > > Are you talking about if you expand the text area and then move the mouse
> > > over an area of whitespace to the right of a given line? If so, then I
> > > thought there was a bug on this already... let me see if I can find it.
> > 
> > That's one problem, here are two test cases:
> > 
> > 1) move your mouse to the lower edge of the textarea, you'll notice there is
> > a ~3 pixel inner boundary where cpfp returns 2 rather than a correct text
> > offset.
> >
> > 2) move your mouse to any text line and move right to the end of the text.
> > You'll notice that after the cursor moves past the last character, cpfp will
> > return an offset equal to the last character in the textarea, rather than
> > the offset at the end of the line.
> 
> Ok, so these problems and the above mentioned problem in comment 11 are
> basically the same thing. What is happening is that the frame for a given
> point is being incorrectly returned (since there's an anonymous document
> structure inside of the text area). I thought there was a bug for this
> already, but a precursory search didn't turn anything up. So, yes, I think
> this should be a followup bug. 
> 
> As an aside, I think what we need to do for textareas is, given a point,
> find the nearest text frame to that point under certain conditions. I'm not
> 100% sure how this will work yet, though, since it's unclear that this will
> always return the correct frame.

Comment 1

[Jim Mathies [:jimm]]

Attachment: testcase

Comment 2

[Jesse Ruderman]

Related to bug 343983?

Comment 3

[Firefox Bug Husbandry Bot]

https://bugzilla.mozilla.org/show_bug.cgi?id=1472046

Move all DOM bugs that haven’t been updated in more than 3 years and has no one currently assigned to P5.

If you have questions, please contact :mdaly.