Git: Make commit a bit less synchronous

If gc.auto is configured, commit can trigger garbage collection, which
takes time. Avoid completely blocking the UI on this case, and at least
show the output of the commit command.

Change-Id: Id301c878c26599bbc363928a6770c04369a62f2f
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/libs/utils/shellcommand.cpp

@@ -338,10 +338,13 @@ SynchronousProcessResponse ShellCommand::runCommand(const FileName &binary,
     if (!(d->m_flags & SuppressCommandLogging))
         proxy->appendCommand(dir, binary, arguments);
 
-    if (d->m_flags & FullySynchronously || QThread::currentThread() == QCoreApplication::instance()->thread())
+    if ((d->m_flags & FullySynchronously)
+            || (!(d->m_flags & NoFullySync)
+                && QThread::currentThread() == QCoreApplication::instance()->thread())) {
         response = runFullySynchronous(binary, arguments, proxy, timeoutS, dir, interpreter);
-    else
+    } else {
         response = runSynchronous(binary, arguments, proxy, timeoutS, dir, interpreter);
+    }
 
     if (!d->m_aborted) {
         // Success/Fail message in appropriate window?

src/libs/utils/shellcommand.h

@@ -101,6 +101,7 @@ public:
         FullySynchronously = 0x80, // Suppress local event loop (in case UI actions are
                                    // triggered by file watchers).
         SilentOutput = 0x100, // Suppress user notifications about the output happening.
+        NoFullySync = 0x200, // Avoid fully synchronous execution even in UI thread.
         NoOutput = SuppressStdErr | SuppressFailMessage | SuppressCommandLogging
     };
 

src/plugins/git/gitclient.cpp

@@ -2721,7 +2721,8 @@ bool GitClient::addAndCommit(const QString &repositoryDirectory,
             arguments << "--signoff";
     }
 
-    const SynchronousProcessResponse resp = vcsFullySynchronousExec(repositoryDirectory, arguments);
+    const SynchronousProcessResponse resp = vcsSynchronousExec(repositoryDirectory, arguments,
+                                                               VcsCommand::NoFullySync);
     const QString stdErr = resp.stdErr();
     if (resp.result == SynchronousProcessResponse::Finished) {
         VcsOutputWindow::appendMessage(msgCommitted(amendSHA1, commitCount));