173362 - Off by one pixel layout rendering errors

Status: RESOLVED DUPLICATE of bug 133133

(Core :: Layout, defect)

Description

[Nathan G. Grennan]

User-Agent:       Mozilla/5.0 Galeon/1.2.6 (X11; Linux i686; U;) Gecko/20021004
Build Identifier: Mozilla/5.0 Galeon/1.2.6 (X11; Linux i686; U;) Gecko/20021004

  I am still seeing classic off by one pixel rendering errors. They have been
around since before 1.0 and I still see them in a very recent nightly build. The
most obvious one is one pixel shift of text upon selecting it. Another less
common, but worse problem is garbling of text that makes it unreadable, caused
by scrolling. Selecting the garbled text turns it to readable form.

  Because of this bugs I am still using Mozilla 1.0.1 with a patch I found long
ago to fix all these annoying bugs. Sadly the patch was abadoned because it
wouldn't apply to the newer 1.1 tree. At this point I want the new features of
1.1 and soon to be 1.2, but I am not willing to live with these off by one pixel
errors. I am getting feed up and I see no reason these haven't been fixed 
completely in the months since 1.0 was released.

  I am pretty sure this is a somewhat isolated problem with high dpi and high
resolution. I use 104dpi and 1600x1200. I remember testing before and seeing
these weren't a problem if the window was half the screen size.

Reproducible: Always

Steps to Reproduce:
1. Set resolution to 1600x1200 on a 21" monitor
2. Set display size in /etc/X11/XF86Config  example  DisplaySize  390        293
3. Use xdpyinfo to get correct dpi
4. Open Mozilla
5. Go to preferences and set the correct dpi. You may have to guess the cm/inchs
to get the right dpi.
6. Close Mozilla
7. Open Mozilla
8. Go to http://www.slashdot.org/
9. Repeatedly select text with the cursor
10. Scroll up and down with a mouse will or page up and down repeatedly
11. Select any text that appears to be unreadable
Actual Results:  
You should see a slight shift in the text when selecting text, about half the
time or more. You should see text that appears to be unreadable after scrolling.
Selecting the unreadable text should make it readable again.

Expected Results:  
No pixel shift on text select and no unreadable text after scrolling. Plus the
other off by pixel problems I haven't mentioned fixed.

Comment 1

[R.B.]

This is a known problem. See e.g. bug 148784, tracking bug 134942.

Comment 2

[Kenneth Herron]

Like RB noted, there are several reports of this sort of problem.

*** This bug has been marked as a duplicate of 133133 ***