Fix decal atlas clipped when using texture resolution < 32 #108073
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This fixes issue #108033.
When a texture's resolution in a decal atlas was < 32, the border margin was no longer taken into account. Resulting in cropped textures in the atlas.
The fix might sound unintuitive, but basically an
atlas_heightof 1 = border size (32).So, an
atlas_heightof 2 = border size * 2. Which is the minimum size required to insert textures into the atlas.