Describe the bug

Auras within normal (non-dynamic) groups are one pixel up and to the right from the expected position.

To Reproduce

Create/import these auras showing a 4x4 pixel colored texture:

• Centered standalone: !WA:2!Df5ZUnnqqyCSYHQ6dajGQqIdiXbehiLKwAOhjonrfuAB0gZFUf217y7vYExRzxN2YXCaXvYJqoZP8iWtGvfpb8i0Na21jQh40o76VXF)MVXBuR8w8w8F8SBnWvMse(mslotXbYGX9pBYkJkAoGAHs(eVz)KqZksPnWRUiowdgVLAilEIsinSbdppCiHLlquHP41BvSMkJsvyTMQDirQmf(bVgEnwYYaj350b9p5KviKy9i86ca3cYn0sJTZlkm2pO9xfPKCXMAKgvx0JOnu04ZIfsHo1pWEy8REaR7HDo(TDxyqrsIL(7)cCB53xXbwzCCTrNoC8KrFCCGXEHqlr6bl0fqw275A))QlzWCqAMAvlUA9Sb9NgoBAyFsyqP1fwrg9AajsAoO9j1szNc0mt6DTobbBRKPtgoE8Ys5we8lA6WFoeU5Ulc(19U1MpakPzFAtAFg5sb3KU7sQuKtDtBVQhn63avdtniitmP7u90aPsc3WTO7umZniOgCjLEHtQBmRAhKtfYrvVY2qv7Q9REDvh75J))xEUGx8qvCCxoKRAVDlCqPGV(4GtZppV4YxYdwhJ2j2Ia1qBC7ML7i3toRythqgo88IMCHocbdmdvMA08ywOIfj(28xtnoGH0v2GIuV31(SuqKKA2Lv3b81GmfL3lWUpI2JKxMze(KOmQwVx178d0IVbUIf39)BPlAE4(D2)O2D71o5nh194UXh2A(F(Y)o

• Centered within a centered group: !WA:2!fov3UTrruywTcfYiOuBGqjuOHkrksihStiUPq5hVU2kTYUXA9Mw4kZS7C2Dh1X7SmZSHKCzUik3sEe81CLFe6tWrr8e0hH8eWSEnub3Wn7E0z((oNV58DgNNvxNxBNTAU1UnA1UrYxVBR9AfVt9P1z1zxC7RcPrVGPK5DLcP6jUUUJCTqFvOuXaL3YdZVPNGF6PufBJaPuy45(6iQaCdRWLQo5G4ynyCMPGeUml4KCWprjlYNvHym)u4nNxfx1khhh3zgz0rGsBzClNj)U64LvrrJm2C62(AdvziE8mUHegB)PtjNzu8KelT13uTm88zmiSioUSVQ97nyu)dh4zkfbTqr3(mDoiepMPjVsxechbzMXw08JNpPBNXbtgh0XpWRW2KWCb9eq9pWgPalm)XJ6nyG)ImH7duHj1pJof0KllYwkbYYBApwcKxB8VwqvWg9leInEEk3axZZmGkJkEw19D4CAwuQunsApiSBVNg0Z)sniIxKyM3bbbhmCqV(b3LZMjJJBXGPYgjBxWzZ7sLb8xyOp5NBppwz1XyJIAOUxxvY(LPkNeHJ763R3tdJKzX8eYYX)JZSJy3ROfgl2dYxmOjZSxy)fwNM8YkCvEXQZSSz8kuEcjL12ZonJwZFAHDrG4hjOA9A4EepT1JldUKMXNslz0gF3(4AEzYm4LavxQtilXKUYvmRTuIysPjP0qzt0NvIPu44d9Ms5zwU4dXVBf87XFa)rByT)BM6rRFXDU2ahBkuWZv08Hsg43DqNHJW3UCL6mL0SOro42eSHB4uUsjvP4ko4M49W3X5YqbKXk5TDNh9i8TulRg(TvQ)FRGo))AYpQ6PKD)gVHTge8MeSgbRFJnX37C89XpWs4dXBrWpcxh)y824NGFkEhCd8Zi4Dj51kx(pccQwRkf2F8g4(HT2P5E3Vf(5dXDj4xG3ZUxKx)1lgn(BzVf(v(urEk11)34mt6Q51yCDKcmWKxpm(Y5nfmtZdfDFG(q7Jhn1u6iqkUdjmf4jPMvdxah(fSDB8(Lgl(GfF)MfFBsQF0F(t)1

• Centered within a centered dynamic group: !WA:2!nov3YTnruy0OPe82sBJlekHFAMqiqNbhItAcLlTCCMKItIzLBcdCr6kTRK2PYAf7Uk)DPNoD6T4hbFnx5hH8eCMm8eKhH8eWUsUDaUIBKwF8zp6778995CyDv(SRVYQRSrJMB2i(jB08PnJwV(G606030WlwkoD8ohG39xpy)(T6EDGqszsps4lPsrE(99s5xCbrsxOVqKQ55xrk0jc5b5AUitHKNFquKIPDMqYcn17j4z6G2D2VFh8KQz1wKkKpZXXXfRYjHSBjjHLxEtSstKAKhpJRrbrMxQe0qTKhhZKQ5xwo94Rhtzbfrr9ppNj3Pt3EB)8UEAZpWKcjzTHQCwA6Uuf6Avra7ewM230n)Sjh3ULF)J973c33RW8rcYtjNZKVRTEsMPnSFVoD7IlReSdJKQtWzKbmfAur2uiGMekslgK5BzG7ngsYKzK0dn40qL9grY4diwwTj8HBdFKxMiJDjJOy(AjllwNmZvudwTDCSf5sfluKrvdT9y5fSK3acpZCxyj4RNbwg(g4BnhV3)TcMKYJZGAsZYZImNXg2GzXLYHxQGq30ZSqcNdpOWiyiCykrPMd(EKNIFbZE4QGPYBL04662Z14pKvKGLmv42nZiSgrlKKYCdQQLmU6DhAmlFw)FVGizlSDrA6chLW1SXYsGyj0L0ZnlrEOXGvKp9w(gaClpLqQHLgrKHDlxnVAUXrMj0MldtzViqsO8c1RUZ1MfKHJz6Tn(fHma3ARDFU)WcfRlFaxNCz1mR8F1WP2I3ESweEsLO8qNJ)Jf50jIOOMu2ardA8WyjNAb3I4TgzpFeNQtU9nvE3TLgr3(Vb(TXD6S)KiBbJas0e3adAI4XO1kmJ0)0d35jBSE0PTdKNnnam0eKQChJTklVkFmsXsJkdfqnth6shGt9W5FZJUrZotxizhjj57jOmC7UT2Rh0XIBJHxr0wddlbhona56c)KBWaUukKjWmoWha1G3hnkiLLrTtyTwBTf8JYPZfoWjO8lYEbChJTeb3fb3db3)UldZ(AOo8aJZ6JH5qWNape(uyE4ZGph(c4lHhHGfq5ZAJPNW6xfaSZ)pFp43cAU(Qp9hAclUx(SuUkuY0SJFhXamuZSZZFW)yP34T45RQYg)B)9J)F54ZtiU4tTIvnW3b6IG9MiF5gCXJ1BSZ(e47qbjmECIUg8ZiOXMWkwFoSA5ZMLp3fEw9t(RF5Vd

The one in a normal group (red) is not aligned with the other two (blue + green = cyan). Magnified screenshot:

Measuring the full screenshot reveals that red is incorrectly centered and the other two are correctly centered.

Did you try having WeakAuras as the only enabled addon and everything else (especially something like ElvUI) disabled?

Yes

Which version of WeakAuras are you using?

3.0.5-16-g45181f3

Are you on World of Warcraft Classic or Retail?

• Classic
• Retail

The problem should apply to both

Was it working in a previous version? If yes, which was the last good one?

I didn't test. The relevant code doesn't seem to have changed for a long time, except for 6472469 (point 3 below) which simply enforces what was already restricted in the options UI.

Additional Info

This is caused by the following factors:

1. Normal groups have an invisible 2x2 frame

   WeakAuras2/WeakAuras/RegionTypes/Group.lua

   Lines 30 to 31 in 45181f3

   	region:SetWidth(2);
   	region:SetHeight(2);

2. Normal groups are anchored by their bottom left corner

   WeakAuras2/WeakAuras/RegionTypes/Group.lua

   Lines 80 to 81 in 45181f3

   	local function modify(parent, region, data)
   	data.selfPoint = "BOTTOMLEFT";

3. Members of a group anchored to the parent group are anchored to the invisible frame's center

   WeakAuras2/WeakAuras/WeakAuras.lua

   Lines 4980 to 4985 in 45181f3

   	local anchorPoint = data.anchorPoint
   	if data.parent then
   	if data.anchorFrameType == "SCREEN" or data.anchorFrameType == "MOUSE" then
   	anchorPoint = "CENTER"
   	end
   	else

Obviously there is 1/1 pixel offset between the center and the bottom left of a 2x2 frame.

The invisible frame used to be 1x1 until b761c2f, causing only half pixel difference between bottom left and center. Change to 2x2 was done to help with texel snapping related issues caused by the partial pixel offset, but a better fix might be to actually align the anchors, e.g. set the selfPoint of a group to CENTER to match the anchorPoint of the children.