Comment 1 Douglas Pollock 2006-01-11 09:46:06 EST

Created attachment 32838 [details]
StyledText with weird selection

Comment 2 Steve Northover 2006-01-11 10:08:00 EST

A festival for carets perhaps?

Comment 3 Ismael Juma 2006-01-11 10:22:12 EST

Just a FYI, I can also see this with eclipe 3.2 M4, GTK+ 2.8.9, X.org 7.0 and Linux 2.6.15.

Comment 4 Douglas Pollock 2006-01-11 10:23:07 EST

After mentioning this on IRC, I suspect this is GTK+ version specific.  It is likely not a recent change in our code base.  Talk to tashiro or ijuma on irc.freenode.net#eclipse-dev for more information (or me, for that matter).

Comment 5 Douglas Pollock 2006-01-11 10:23:49 EST

pango 1.10.2

Comment 6 Billy Biggs 2006-01-11 11:03:53 EST

The pango version may be the most critical (and whether pango-cairo is used).
There have been some bugs found recently with zero-width characters under
pango-cairo.  Just a guess though really.

Comment 7 Ismael Juma 2006-01-11 11:06:41 EST

From the discussions on IRC, this happens with two versions of pango, 1.10.2 and 1.11.1.

Comment 8 Tom Hofmann 2006-01-16 11:20:57 EST

*** Bug 123935 has been marked as a duplicate of this bug. ***

Comment 9 Felipe Heidrich 2006-02-14 15:09:26 EST

*** Bug 127786 has been marked as a duplicate of this bug. ***

Comment 10 Francesco Gigli 2006-02-15 17:16:03 EST

*** Bug 128028 has been marked as a duplicate of this bug. ***

Comment 11 Francesco Gigli 2006-02-15 17:20:50 EST

same problem here
gtk+ 2.8.8
pango 1.10.3
cairo 1.0.2

Comment 12 Felipe Heidrich 2006-02-16 12:26:43 EST

*** Bug 125220 has been marked as a duplicate of this bug. ***

Comment 13 Felipe Heidrich 2006-02-16 17:25:48 EST

Billy:

I wrote a test code for this problem in C and it worked just fine, I got the same c code and I pasted it in a JNI method and compiled it as library, from java I only load the library and call the jni method and the problem happens.

SSQ told me that the some c library load by the java vm has a bug with float point math that causes this problem to happen. Billy, do you know anything about this ?

Comment 14 Billy Biggs 2006-02-16 17:32:59 EST

If you see this it is likely a floating point precision problem in cairo.  Let
me find the magic code.

Comment 15 Billy Biggs 2006-02-16 17:36:21 EST

Use this template at the start of your test application:

#include <gtk/gtk.h>
#include <fpu_control.h>

int main (int argc, char **argv)
{
    fpu_control_t fpu_control;

    _FPU_GETCW (fpu_control);
    fpu_control &= ~_FPU_EXTENDED;
    fpu_control |= _FPU_DOUBLE;
    _FPU_SETCW (fpu_control);

And see this cairo bug:

  https://bugs.freedesktop.org/show_bug.cgi?id=5200

Comment 16 Felipe Heidrich 2006-02-16 18:37:28 EST

Thanks billy, you the man!

I verified that in extended fpu it works fine.
The problem here is in gdk_pango_layout_get_clip_region(), this func  returns a region that is one pixel to short when the planets are not aligned properly (so far they are: font, text, pango version, and last but not least: FPU mode).

The trivial fix is to flip the FPU to extended before calling gdk_pango_layout_get_clip_region() and restore it after. But that doesn't work, the metrics are computed by the pango layout and cached, I don't know when it gets computed, sometime during pango_draw or pango_size_get, etc.
Set extended right when the app start fixes the problem, but the VM probably has a reason to FPU to double mode.

Not sure I can fix this.

Comment 17 Douglas Pollock 2006-02-17 10:43:45 EST

I've posted to https://bugs.freedesktop.org/show_bug.cgi?id=5200 -- mentioning that their current suggested patch does not work, and asking for a workaround.

Comment 18 Silenio Quarti 2006-03-28 14:16:24 EST

*** Bug 132447 has been marked as a duplicate of this bug. ***

Comment 19 Michael Van Meekeren 2006-04-05 17:01:33 EDT

this item is on the polish list for 3.2, will it be fixed for 3.2?

Comment 20 Felipe Heidrich 2006-04-12 16:09:53 EDT

I can't get this to work with Eclipse, I change the code to flip the mpu mode to extended but (I think) the VM keeps flipping it back to double precision.
The fix worked for the simple testcase but with eclipse.

Comment 21 Billy Biggs 2006-04-12 16:23:00 EDT

Note that the upstream bug is now fixed in pango CVS.

Comment 22 Steve Northover 2006-04-20 12:08:47 EDT

Billy, we need to put in a work around for this but guard it with a version check and only run the code when we have to.  Can you help us determine which versions have the bug and which do not?

Comment 23 Dani Megert 2006-04-21 05:44:42 EDT

*** Bug 137910 has been marked as a duplicate of this bug. ***

Comment 24 Felipe Heidrich 2006-05-02 11:46:33 EDT

I just had my machine updated to Fedora Core 5 and I have the bug now:
-sh-3.1$ rpm -q gtk2 glib2 pango cairo
gtk2-2.8.17-1.fc5.1
glib2-2.10.2-1.fc5.1
pango-1.12.1-1.fc5.1
cairo-1.0.4-1

Past week I was running gtk-2.8.17, glib-2.10.2, cairo-1.0.4, and pango-1.13.0 in my old Fedora Core 3 and it was all working fine.
I think this bug got fixed between pango 1.12.1 and pango 1.13.0. I verify it and report back.

Comment 25 Ben Konrath 2006-05-02 13:23:41 EDT

(In reply to comment #24)
> I think this bug got fixed between pango 1.12.1 and pango 1.13.0. I verify it
> and report back.

I think you're right - at least that's what the changelog says :)

http://cvs.gnome.org/viewcvs/pango/ChangeLog?view=markup
 

Comment 26 Felipe Heidrich 2006-05-02 17:08:01 EDT

I verified it works on pango 1.13.0

Comment 27 Felipe Heidrich 2007-04-30 11:11:49 EDT

closing

Comment 28 Felipe Heidrich 2009-08-19 13:55:45 EDT

*** Bug 112858 has been marked as a duplicate of this bug. ***