fix(IconManager) Fix icon frame x/y for auto packed icons #9928
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Background
When auto packing is enabled, the icon manager must reserve space for the width/height declared by the icon definition, even before icon is loaded. After an icon loads, it is resized and centered in that reserved space/box. #7651 fixed a bug where the icon image itself would be stretched to completely fill the box, distorting the icon if it had an aspect ratio which differed from that of the box. However, for the icon mapping that the icon manager returns, that PR only updated the width/height fields, and not the x/y. So when retrieving a mapping, an icon frame would be returned with the correct size, but not centered where the actual icon is, resulting in icons not displaying properly.
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