a1b365111fe01f2ea647f6981212322aaed7b2f6
hidden state." (#40542) (flutter/engine#42418)
## Description
This reverts commit 879917b to re-land #40542 to fix the lint warning which caused the original PR to be reverted (the lint warnings were turned on after the original was landed, which is why it wasn't caught earlier).
Reland: "Adding app lifecycle notification for macOS and Linux, add
hidden state." (#40542) (flutter/engine#42418)
Description
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