I made a slice for backporting the fix to Pharo 4: https://pharo.fogbugz.com/f/cases/15423/Backport-Pharo4-15422-SHTextStyler-styleInBackgroundProcess-should-not-set-the-text-if-styling-process-was-terminated
Can you load it and check that it fixes the problem.

Cheers,
Andrei

On Mon, May 4, 2015 at 11:18 AM, Andrei Chis <chisvasileandrei@gmail.com> wrote:
I need to double check again that the fix solves this problem and then backport it from Pharo 5 to Pharo 4.

Cheers,
Andrei

On Sun, May 3, 2015 at 10:12 PM, Tudor Girba <tudor@tudorgirba.com> wrote:
Indeed, it's a known issue and Andrei already investigated it. There is a discussion on the Pharo-dev mailing list.

Cheers,
Doru

On Sun, May 3, 2015 at 11:11 PM, Alexandre Bergel <alexandre.bergel@me.com> wrote:
Hi!

When tracing the execution in GT-debugger the text selection does not always reflect the real position of the program counter. Consider the following screenshot:

I have simply pressed the step-into button, nothing more. The selection is not meaningful.
Am I the only one to have noticed this?
It would be great to have it fixed…

Cheers,
Alexandre

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Alexandre Bergel  http://www.bergel.eu
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