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MQ’s Rules for Applying Patches

The rules that MQ uses when deciding whether to apply a patch are as follows:

A patch that has no guards is always applied.
If the patch has any negative guard that matches any currently selected guard, the patch is skipped.
If the patch has any positive guard that matches any currently selected guard, the patch is applied.
If the patch has positive or negative guards, but none matches any currently selected guard, the patch is skipped.

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