Symfony console ProgressBar component is not displayed in composer scripts

Using the ProgressBar component in a command called by a composer script has no effect as the ProgressBar output is not shown.

Why is this? Is there a way to enforce its rendering?

Update: Now (since upgrade to symfony 2.6) it is shown, but the console refresh doesn't work correctly and for each update is adds a new line...


Make sure that you're using a up-to-date version of the component. Check if the bar works correct with the following snippet:

$progress = new ProgressBar($output, $max);

for ($i = 0; $i <= $max; ++$i) {

If this is the case, the task you execute between every $progress->advance(); step seems to write something to output which makes the bar be redrawn on every step.

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