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Documentation : Make operator priority clearer)

Signed-off-by: Gabriel Ravier <gabravier@gmail.com>

--- a/src/Flags.cpp

+++ b/src/Flags.cpp

@@ -6,9 +6,9 @@

 // Macros for setting, un-setting and getting flags

 // Each flag is stored in a bit, so we can use the exact same macros we'd use for bits

-#define SET_FLAG(x, i) ((x)[(i) / 8] |= 1 << (i) % 8)

-#define UNSET_FLAG(x, i) ((x)[(i) / 8] &= ~(1 << (i) % 8))

-#define GET_FLAG(x, i) ((x)[(i) / 8] & (1 << (i) % 8))

+#define SET_FLAG(x, i) ((x)[(i) / 8] |= 1 << ((i) % 8))

+#define UNSET_FLAG(x, i) ((x)[(i) / 8] &= ~(1 << ((i) % 8)))

+#define GET_FLAG(x, i) ((x)[(i) / 8] & (1 << ((i) % 8)))

 unsigned char gFlagNPC[1000];

 unsigned char gSkipFlag[8];