Text corruption when scrolling pages with control characters



Core Graveyard
GFX: Gtk
15 years ago
9 years ago


(Reporter: pooka_regent, Assigned: blizzard)


Firefox Tracking Flags

(Not tracked)





15 years ago
User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.5b) Gecko/20030801 Mozilla Firebird/0.6.1
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.5b) Gecko/20030801 Mozilla Firebird/0.6.1

When I scroll upward or downward on this page using the arrow keys, the 
Page Up/Page Down keys, or the mouse wheel, and I start the scrolling at
or near a location containing control characters, bits of text from
previously scrolled-through text areas are erroneously printed on top of
the text area that is currently visible on the page.

Reproducible: Always

Steps to Reproduce:
1. Start Mozilla Firebird, and go to the specified URL.

2. Scroll down via either the mouse wheel, the Down arrow key, or the
Page Down key, until one of the lines containing:

(a) a timestamp such as [09:04]

followed by

(b) <CIA>

and then

(c) a mix of control characters and normal text

is displayed at or near the top of the browser window.

3. Observe the text corruption.

4. Scroll down more for a page or so, and then scroll back up to where
you were in step 2.

5. Observe the text corruption.

Actual Results:  
Bits of text from previously scrolled-through locations on the page were
erroneously printed at various locations over the text at the current
location on the page.  After I edited the page to remove the control
characters and repeated the above steps, the problem no longer occurred.

Expected Results:  
The text of the page should not have any bits of text from previous page
locations erroneously printed over it when the page is scrolled.

I have compiled Mozilla Firebird with GTK2 as the default toolkit.

Notes on the text corruption:

Changing focus to another window clears many of the bits of text away.
Moving another window over the affected areas of the browser window and
then moving it off those areas moves the bits of text around but doesn't
clear them away.  Selecting the text of the affected areas with the
mouse clears the bits of text away if the affected areas do not contain
control characters; if they do, more bits of text are erroneously
printed in the selected areas.

Comment 1

15 years ago
WFM on Windows 2000 with 20030803 build.
Could be a GTK2-issue. 

Reporter could you compile a new build without GTK2 to test this?

Comment 2

15 years ago
Done.  The problem doesn't occur with GTK1-enabled Firebird 20030805.  
Furthermore, when I was testing this bug to see if it was actually a bug
 in Mozilla (Seamonkey), I was using GTK1-enabled Mozilla CVS; I tried 
GTK2-enabled Mozilla 20030805 and the problem occurred there as well.  So it 
appears that this is actually a bug in Seamonkey, instead of just in 
Firebird.  Sorry for the wasted time.

Comment 3

15 years ago
Ok, moving over
Assignee: blake → blizzard
Component: General → GFX: Gtk
Product: Firebird → Browser
QA Contact: asa → ian
Version: unspecified → Trunk

Comment 4

15 years ago
Can you make a screenshot?  I don't have any problems here.
Blocks: 198955

Comment 5

15 years ago
On closer inspection, it appears that the GTK2-enabled Seamonkey build that had
the problem wasn't built on top of a clean tree.  I did a clean GTK2-enabled
build of Seamonkey 20030811 and the problem didn't occur.  However, GTK2-enabled
Firebird 20030811 does have the problem (as does GTK2-enabled Mozilla 1.4,
notably).  So apparently this is a Firebird problem after all.  Sorry again.
Severity: minor → trivial
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Last Resolved: 12 years ago
Resolution: --- → EXPIRED
Product: Core → Core Graveyard
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