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dotCooCoo
dd676a4243
A font family field looked up its wheel state with `ui.data(|d| ... ui.ctx().viewport_id() ...)`, in two places. The closure of `ui.data` runs with the egui context read-locked, and `viewport_id()` locks it for reading again. The threads that render the menu's samples call `request_repaint()` when they finish, which locks the context for writing. A write request that arrives between the two reads waits for the first read to end, and the second read waits behind the write request, so neither thread goes on. A release build stays blocked; a debug build of egui panics after ten seconds with "Failed to acquire RwLock read after 10s". `font_menu` now reads the viewport id once, before either `ui.data` call, and uses the resulting id in both. The new test draws a closed font field for 2,000 passes while four threads call `request_repaint()` on the same context. With either lookup put back inside its closure, it fails with that panic.