Pixelmator 2.6.3 更新内容：
Pixelmator 2.6.3 brings one new keyboard shortcut and a few fixes.
You can now select the Clone tool by pressing the O key.
When exporting images with transparency to PNG, their transparency would not be preserved. Fixed.
In certain cases, a flattened version of incompatible Pixelmator files would be opened automatically without explaining why they were incompatible. Fixed.
Sometimes, certain brushes would not appear in the brushes browser. Fixed.
Undoing edits using keyboard shortcuts while using the selection tools would cause the redo stack to be cleared. Fixed.
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