[lldb] Do not stop the process on SIGWINCH by default. (#163182)

SIGWINCH is sent when the terminal window size changes.. Most people
debugging do not want the process on this signal.

When using lldb-dap, the user may be using an integrated terminal and
may resize the pane/window mulitple times when debugging. this causes
the signal to be sent multiple times. It gets in the way.

The process ignores this signal by default

Author: da-viper

lldb/source/Plugins/Process/Utility/GDBRemoteSignals.cpp

@@ -47,7 +47,7 @@ void GDBRemoteSignals::Reset() {
   AddSignal(25,     "SIGXFSZ",      false,    true,   true,   "file size limit exceeded");
   AddSignal(26,     "SIGVTALRM",    false,    true,   true,   "virtual time alarm");
   AddSignal(27,     "SIGPROF",      false,    false,  false,  "profiling time alarm");
-  AddSignal(28,     "SIGWINCH",     false,    true,   true,   "window size changes");
+  AddSignal(28,     "SIGWINCH",     false,    false,   false,   "window size changes");
   AddSignal(29,     "SIGLOST",      false,    true,   true,   "resource lost");
   AddSignal(30,     "SIGUSR1",      false,    true,   true,   "user defined signal 1");
   AddSignal(31,     "SIGUSR2",      false,    true,   true,   "user defined signal 2");

lldb/source/Plugins/Process/Utility/LinuxSignals.cpp

@@ -160,7 +160,7 @@ void LinuxSignals::Reset() {
   ADD_LINUX_SIGNAL(25,     "SIGXFSZ",      false,    true,   true,   "file size limit exceeded");
   ADD_LINUX_SIGNAL(26,     "SIGVTALRM",    false,    true,   true,   "virtual time alarm");
   ADD_LINUX_SIGNAL(27,     "SIGPROF",      false,    false,  false,  "profiling time alarm");
-  ADD_LINUX_SIGNAL(28,     "SIGWINCH",     false,    true,   true,   "window size changes");
+  ADD_LINUX_SIGNAL(28,     "SIGWINCH",     false,    false,   false,   "window size changes");
   ADD_LINUX_SIGNAL(29,     "SIGIO",        false,    true,   true,   "input/output ready/Pollable event", "SIGPOLL");
   ADD_LINUX_SIGNAL(30,     "SIGPWR",       false,    true,   true,   "power failure");
   ADD_LINUX_SIGNAL(31,     "SIGSYS",       false,    true,   true,   "invalid system call");

llvm/docs/ReleaseNotes.md

@@ -176,6 +176,9 @@ Changes to LLDB
 
 * LLDB can now set breakpoints, show backtraces, and display variables when
   debugging Wasm with supported runtimes (WAMR and V8).
+* LLDB no longer stops processes by default when receiving SIGWINCH signals 
+  (window resize events) on Linux. This is the default on other Unix platforms.
+  You can re-enable it using `process handle --notify=true --stop=true SIGWINCH`.
 * The `show-progress` setting, which became a NOOP with the introduction of the
   statusline, now defaults to off and controls using OSC escape codes to show a
   native progress bar in supporting terminals like Ghostty and ConEmu.