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test-bottom-sheet: Pass alignment in varargs correctly

Simon McVittie requested to merge wip/smcv/issue913 into main

The type of the property is declared to be G_TYPE_FLOAT, therefore it must be passed on the stack as a float (which in practice is promoted to double via the "default argument promotions" as defined by Standard C).

Previously the alignment was written to the stack as a 4-byte integer, but read off as an 8-byte double, causing undefined behaviour (in practice dependent on uninitialized stack contents).

Resolves: #913 (closed)

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