round layout position in resolve_positions #265
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…being unaligned with the pixel grid
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sometimes, a widget can be in a position that's not aligned with the pixel grid, and this causes ugly renders like these when MSAA is enabled:
(figure 1: normal render)
(figure 2: problematic render)
we'd like to stop this from happening, this looks Bad.
the code here seems to work, though it might not work well on HiDPI situation? there needs to be more testing. in our own project it seems to work (we've not tested HiDPI) but maybe there's some case we're not catching.