`WOW_MAP_TRACE=1` named it on grom's first run, in one line:
detail 1431x954 @scale 0.70 | 1 256x256 @(10,1122) | 2 256x256 @(266,1122) | ...
1.12's `WorldMapDetailFrame` is always 1002x668, so everything drawn into it is placed in absolute
pixels against that: twelve 256x256 tiles anchor-chained from its TOPLEFT, each exploration overlay
at the offset `WorldMapOverlay.dbc` gives it. The canvas breaks that the moment it sizes the frame
to anything else, and it does — `OnCanvasSizeChanged` falls back to the container's own rect
whenever it has no art layer to read, which is every moment the canvas has no `mapID`, including
the world-view blip the same log shows on every map open.
So: a 1024x768 sheet of art pinned to the top-left of a 1431x954 frame, covering 72% of the width
and 80% of the height, with the rest of the map drawing nothing. That is the grey he reported,
with the art magnified relative to what was left of the frame.
The art is now rescaled to whatever size the frame has. The tiles need only their size set, because
the XML chains them TOPRIGHT-to-TOPLEFT and BOTTOMLEFT-to-TOPLEFT. The overlays carry absolute
offsets, so they are captured from what the stock repaint last wrote — hooked on
`WorldMapFrame_Update`, the only moment those base values are readable — and scaled from that base,
so a second pass cannot compound. Measured: a 1431x954 frame now holds a 1462x1097 grid, the same
1024/1002 and 768/668 proportion the reference frames.
Two smaller faults fell out and are fixed with it: the container resizing was not treated as a
canvas size change at all (the canvas was re-sized only on a map change), and a derived resize
fires no `OnSizeChanged` here, so the rescale takes the size its caller just set rather than
reading the frame back, which would answer the old one.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SgstFWtn1RxEJ5kVrpgYwn
gromandClaude Opus 5
7f97777597