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Slow capture restart

Any idea why restarting capture is extremely slow in wireshark (if the amount of captured data was large)? I use Version 2.4.2 (v2.4.2-0-gb6c63ae086) and I capture around 100MB of udp packets, when i try to restart capture it takes extremely long time (over 10 seconds) and wireshark blocks entire window and becomes unresponsive during this time.

I have enough ram, it shouldn't block on that, should just close that existing capture run (by releasing all associated resources) in some background thread.

Another point: I prefer to use keyboard shortcuts to restart capture and "Continue without Saving". The Ctrl+R dialog (to restart capture) doesn't handle properly keyboard input, if I press Tab or [right/left] the "Continue without Saving" button doesn't get the same handling as the other two.