IDEA-153533 Fixed svn output reading in Windows in interactive mode

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

@@ -17,6 +17,7 @@ package org.jetbrains.idea.svn.commandLine;
 
 import com.intellij.openapi.util.Key;
 import com.intellij.openapi.util.text.StringUtil;
+import com.intellij.util.io.BaseDataReader;
 import org.jetbrains.annotations.NotNull;
 
 /**
@@ -37,6 +38,19 @@ public class WinTerminalProcessHandler extends TerminalProcessHandler {
     return true;
   }
 
+  @NotNull
+  @Override
+  protected BaseDataReader createOutputDataReader(@NotNull BaseDataReader.SleepingPolicy sleepingPolicy) {
+    // Currently, when blocking policy is used, reading stops when nothing was actually read (stream ended).
+    // This is an issue for reading output in Windows as redirection to file is used. And so file is actually
+    // empty when first read attempt is performed (thus no output is read at all).
+    // So here we ensure non-blocking policy is used for such cases.
+    sleepingPolicy =
+      useAdaptiveSleepingPolicyWhenReadingOutput() ? new BaseDataReader.AdaptiveSleepingPolicy() : BaseDataReader.SleepingPolicy.SIMPLE;
+
+    return super.createOutputDataReader(sleepingPolicy);
+  }
+
   @NotNull
   @Override
   protected String filterCombinedText(@NotNull String currentLine) {