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Qt 4.2.1 is a bug-fix release. It maintains both forward and backward
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compatibility (source and binary) with Qt 4.2.0.
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The Qt version 4.2 series is binary compatible with the 4.1.x and 4.0.x series.
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Applications compiled for 4.0 or 4.1 will continue to run with 4.2.
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Fixed a potential security issue which could arise when transforming
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images from untrusted sources.