[vcs] Revert making vcs processes blocking (cff1ba8) since it seem to cause thread hangs: IDEA-143143 IDEA-142540

platform/util/resources/misc/registry.properties

@@ -594,7 +594,7 @@ database.native.loading.description=Enables native schema loader if present
 database.native.loading=true
 
 git.status.write=true
-git.blocking.read=true
+git.blocking.read=false
 
 cidr.cygwin.cmakePermissionsFix=true
 cidr.cygwin.cmakePermissionsFix.description=Update permissions for the bin/ folder inside the installed IDE so that the bundled CMake could run

plugins/hg4idea/src/org/zmlx/hg4idea/execution/HgCommandProcessHandler.java

@@ -68,9 +68,4 @@ class HgCommandProcessHandler extends OSProcessHandler {
       return HgCommandProcessHandler.this.executeOnPooledThread(runnable);
     }
   }
-
-  @Override
-  protected boolean useNonBlockingRead() {
-    return false;
-  }
 }

plugins/svn4idea/src/org/jetbrains/idea/svn/commandLine/SvnProcessHandler.java

@@ -85,9 +85,4 @@ public class SvnProcessHandler extends OSProcessHandler {
       return SvnProcessHandler.this.executeOnPooledThread(runnable);
     }
   }
-
-  @Override
-  protected boolean useNonBlockingRead() {
-    return false;
-  }
 }

plugins/svn4idea/src/org/jetbrains/idea/svn/commandLine/TerminalProcessHandler.java

@@ -57,6 +57,11 @@ public class TerminalProcessHandler extends SvnProcessHandler {
     process.destroy();
   }
 
+  @Override
+  protected boolean useNonBlockingRead() {
+    return false;
+  }
+
   @Override
   public void notifyTextAvailable(String text, Key outputType) {
     terminalOutputCapturer.onTextAvailable(new ProcessEvent(this, text), outputType);