kWalletStackTextScale top-level constant
double
const kWalletStackTextScale
Past this multiple of the body text size, a low-vision user's chosen size must WIN the row: the trailing action moves onto its own line rather than squeezing the text it sits beside.
Measured origin (parked rows, arch review M-A1 swap rows, #409 R3 notices): above ~1.4x a trailing button's intrinsic width exceeds what the shared row can give it, and the flexible text collapses toward zero.
Implementation
const double kWalletStackTextScale = 1.4;