[lldb] Fix ^C handling in IOHandlerProcessSTDIO #4087
Merged
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D120762 accidentally moved the interrupt check into the block which was
reading stdio. This meant that a ^C only took effect after a regular
character has been pressed.
This patch fixes that and adds a (pexpect) test.
Differential revision: https://reviews.llvm.org/D121912
(cherry picked from commit f93d861)