252252 - Large amounts of text in textboxes cause the text to be displayed incorrectly

Status: RESOLVED WORKSFORME

(Core :: Layout: Text and Fonts, defect)

Description

[Daniel Brooks [:db48x]]

It appears that the the text is drawn as multiple overlapping strings of text.
What is interesting is that the number of characters you need to type varies
based on font, font size and character width, so it must depend on the total
length of the string in pixels as drawn on the screen. Depending on exactly how
Mozilla draws text, this could of course be a bug in GTK2.

This may or may not be the same as bug 35229, since trev on irc reported that he
didn't see the problem on windows, but that the text dissapeared after 65536
characters. Clearly the same kind of problem, however.

I'll attach a screenshot of this bug in action on my computer for clarity.

Comment 1

[Daniel Brooks [:db48x]]

Attachment: screenshot of mozilla exhibiting the bug

In this screenshot the url in question is a data: url containing an image.
You'll notice that while this happens in the <textbox>es in the urlbar and page
info, it doesn't happen in the treecell.

Comment 2

[Daniel Brooks [:db48x]]

also, now that I think about it, I can demonstrate the problem by putting that
data url into the url field of this bug, as it also occurs in text inputs. :)

Comment 3

[R.K.Aa.]

there are no spaces and the line doesn't wrap.. dup of bug 99457?

Comment 4

[Daniel Brooks [:db48x]]

No, this bug is only about the rendering defect that occurs in textboxes. It
doesn't matter if the string contains spaces, the problem still occurs becuase
textboxes are all single line. The source of a page containing a long string
with no spaces like this will also trigger bug 99457, but it's still a different
bug. (I guess a <textarea> would also have less of a problem if it could wrap
the text.)

Comment 5

[Wayne Mery (:wsmwk)]

looks fine here with current trunk