isAdaptiveIconConfigPngFile function

bool isAdaptiveIconConfigPngFile(
  1. String backgroundFile
)

Returns true if the adaptive icon background should be treated as an image file (vs a hex color literal). Anything that isn't a hex color literal is treated as a file path, supporting .png, .jpg, .jpeg, .webp, and any other extension the decoder accepts. The old endsWith('.png') check mis-routed non-PNG paths into colors.xml, breaking mergeDebugResources (upstream #616/#617/#665).

Implementation

bool isAdaptiveIconConfigPngFile(String backgroundFile) {
  return !isHexColorLiteral(backgroundFile);
}