Qt App Packet Sender Gains Live Theme Switching via QTimer on Main Thread

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Packet Sender, a network utility maintained by Dan Nagle, had a bug where dark mode elements persisted after switching to light mode, requiring a restart to apply the correct theme. The app lacked the ability to respond dynamically when the operating system changed themes at runtime, such as during automatic time-based transitions. An initial attempt to fix this using a QThread caused crashes, because reading OS appearance and calling setPalette() from a background thread races the GUI toolkit and leads to undefined behavior on macOS. The working solution used a QTimer parented to the main application object, ensuring theme checks and updates run on the same thread that owns the widgets, keeping all operations serialized within Qt's event loop. Qt 6.5 and later offers a cleaner alternative via QStyleHints::colorSchemeChanged(), though the QTimer polling approach remains valid as it avoids cross-thread issues entirely.

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Google Keeps AdX After Court Rejects DOJ Breakup Bid, Opts for Behavioral Fixes

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ProgrammingHacker News ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

How to Fix WSL 2.7.x ERROR_FILE_NOT_FOUND Caused by Missing system.vhd

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