Fix crash because "Stop Recording" could be pressed twice #688
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Disable the stop button as soon as it is pressed instead of waiting to do it in the `recordingStopped` function, so it can't be pressed again which caused a crash. The `recordingStopped` function isn't immediately called after pressing stop because perf can take a while to finish after it is asked to terminate (eg: if debuginfod is enabled and has to download symbols, or if the trace is very big).
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Disable the stop button as soon as it is pressed instead of waiting to do it in the
recordingStoppedfunction, so it can't be pressed again which caused a crash. TherecordingStoppedfunction isn't immediately called after pressing stop because perf can take a while to finish after it is asked to terminate (eg: if debuginfod is enabled and has to download symbols, or if the trace is very big).