Copies the contents for the given tag into the value, merging multiple values into one if multiple values are associated with the tag. You must g_value_unset() the value after use.
uninitialized #GValue to copy into
list to get the tag from
tag to read out
Return: %TRUE, if a value was copied, %FALSE if the tag didn't exist in the given list.
See Implementation
Copies the contents for the given tag into the value, merging multiple values into one if multiple values are associated with the tag. You must g_value_unset() the value after use.