Ensure proper cleanup of pump threads in terminal implementations #1162
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This commit fixes a bug where pump threads were not being properly closed in
terminal implementations. The issue occurred in both ExternalTerminal and
PosixPtyTerminal classes where the pause() method was directly setting the
paused flag without properly handling thread interruption.
Changes:
instead of directly setting the paused flag
This fix prevents potential thread leaks where pump threads might continue
running in the background after they're no longer needed, ensuring proper
resource cleanup.