GameTooltip re-sized itself on every resolve from its lines, at 10/40/260 units, counting a taller right text. So `GetWidth` after `Show` read stale, a script's `SetHeight` after `AddLine` was overwritten, and descriptions wrapped wide.
1.12.1 sizes only in the show (`0x530aad`), `AppendText` (`0x530615`) and the cache answers, never in `AddLine` (`0x531630`). `GameTooltipSize` (`0x530640`) takes the widest unwrapped line plus a 38.4 gap, wraps the rest at the running widest (capped at 230.4), sums shown left heights with 2.0 gaps, pads 10.24 a side, then re-anchors without clearing.
Now the sizer is that function, called from those sites, and the engine no longer anchors line cells; the stock templates declare them. A measure memo keeps a steady hover from measuring again. Tests pin each loop, constant and caller.
Found in Thorsten42/manila@50452d3fa5.
Fixes#1206Fixes#1182Fixes#1540🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Sam Sung
20abc74643