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Changes between Initial Version and Version 1 of Ticket #1571, comment 2

initial	v1
1	1	There's also the market case (insufficient resources to barter), gate upgrade costs, etc., though these are much less common cases than what you've implemented support for.
2	2
3		Though this is completely outside the scope of this patch: I think it's rather unfortunate that overlays require a whole new set of objects. It'd be nice to be able to apply arbitrary blending by manipulating sprite effects in unit-commands.js similarly to how text properties are handled. Although first we'd need proper blending capability,
	3	Though this is completely outside the scope of this patch: I think it's rather unfortunate that overlays require a whole new set of objects. It'd be nice to be able to apply arbitrary blending by manipulating sprite effects in unit-commands.js similarly to how text properties are handled. Although first we'd need proper blending capability, as the 'add_color' sprite effect does exactly that (additive only).