Improve filtering of ANSI escape sequences in build logs

All ANSI sequences except color setting are now filtered out. In
particular, terminal resets (such as from NixOS VM tests) are filtered
out.

Also, fix the completely broken tab character handling.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 5be7ce60d..9f669f7e4 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -3428,7 +3428,7 @@ void DerivationGoal::flushLine()
     else {
         if (settings.verboseBuild &&
             (settings.printRepeatedBuilds || curRound == 1))
-            printError(filterANSIEscapes(currentLogLine, true));
+            printError(currentLogLine);
         else {
             logTail.push_back(currentLogLine);
             if (logTail.size() > settings.logLines) logTail.pop_front();