8189595: jshell tool: line redrawn on each completion

Reviewed-by: rfield

src/jdk.jshell/share/classes/jdk/internal/jshell/tool/ConsoleIOContext.java

@@ -237,7 +237,11 @@ class ConsoleIOContext extends IOContext {
                                              .distinct()
                                              .count() == 2;
                 boolean tooManyItems = suggestions.size() > in.getAutoprintThreshold();
-                CompletionTask ordinaryCompletion = new OrdinaryCompletionTask(suggestions, anchor[0], !command && !doc.isEmpty(), hasSmart);
+                CompletionTask ordinaryCompletion =
+                        new OrdinaryCompletionTask(suggestions,
+                                                   anchor[0],
+                                                   !command && !doc.isEmpty(),
+                                                   hasBoth);
                 CompletionTask allCompletion = new AllSuggestionsCompletionTask(suggestions, anchor[0]);
 
                 todo = new ArrayList<>();
@@ -439,16 +443,16 @@ class ConsoleIOContext extends IOContext {
         private final List<Suggestion> suggestions;
         private final int anchor;
         private final boolean cont;
-        private final boolean smart;
+        private final boolean showSmart;
 
         public OrdinaryCompletionTask(List<Suggestion> suggestions,
                                       int anchor,
                                       boolean cont,
-                                      boolean smart) {
+                                      boolean showSmart) {
             this.suggestions = suggestions;
             this.anchor = anchor;
             this.cont = cont;
-            this.smart = smart;
+            this.showSmart = showSmart;
         }
 
         @Override
@@ -460,7 +464,7 @@ class ConsoleIOContext extends IOContext {
         public Result perform(String text, int cursor) throws IOException {
             List<CharSequence> toShow;
 
-            if (smart) {
+            if (showSmart) {
                 toShow =
                     suggestions.stream()
                                .filter(Suggestion::matchesType)
@@ -487,7 +491,7 @@ class ConsoleIOContext extends IOContext {
             String prefixStr = prefix.orElse("").substring(cursor - anchor);
             in.putString(prefixStr);
 
-            boolean showItems = toShow.size() > 1 || smart;
+            boolean showItems = toShow.size() > 1 || showSmart;
 
             if (showItems) {
                 in.println();
@@ -495,7 +499,7 @@ class ConsoleIOContext extends IOContext {
             }
 
             if (!prefixStr.isEmpty())
-                return showItems ? Result.SKIP : Result.SKIP_NOREPAINT;
+                return showItems ? Result.FINISH : Result.SKIP_NOREPAINT;
 
             return cont ? Result.CONTINUE : Result.FINISH;
         }

test/langtools/jdk/jshell/ToolTabCommandTest.java

@@ -84,10 +84,6 @@ public class ToolTabCommandTest extends UITesting {
             inputSink.write("\u0003/env \011");
             waitOutput(out, "\u0005/env -\n" +
                             "-add-exports    -add-modules    -class-path     -module-path    \n" +
-                            "\r\u0005/env -");
-
-            inputSink.write("\011");
-            waitOutput(out, "-add-exports    -add-modules    -class-path     -module-path    \n" +
                             "\n" +
                             Pattern.quote(getResource("jshell.console.see.synopsis")) + "\n" +
                             "\r\u0005/env -");

test/langtools/jdk/jshell/ToolTabSnippetTest.java

@@ -23,7 +23,7 @@
 
 /**
  * @test
- * @bug 8177076 8185426
+ * @bug 8177076 8185426 8189595
  * @modules
  *     jdk.compiler/com.sun.tools.javac.api
  *     jdk.compiler/com.sun.tools.javac.main
@@ -227,6 +227,31 @@ public class ToolTabSnippetTest extends UITesting {
         });
     }
 
+    public void testNoRepeat() throws Exception {
+        doRunTest((inputSink, out) -> {
+            inputSink.write("String xyzAA;\n");
+            waitOutput(out, "\u0005");
+
+            //xyz<tab>
+            inputSink.write("String s = xyz\011");
+            waitOutput(out, "^String s = xyzAA");
+            inputSink.write(".");
+            waitOutput(out, "^\\.");
+
+            inputSink.write("\u0003");
+            waitOutput(out, "\u0005");
+
+            inputSink.write("double xyzAB;\n");
+            waitOutput(out, "\u0005");
+
+            //xyz<tab>
+            inputSink.write("String s = xyz\011");
+            String allCompletions =
+                    Pattern.quote(getResource("jshell.console.completion.all.completions"));
+            waitOutput(out, ".*xyzAA.*" + allCompletions + ".*\u0005String s = xyzA");
+        });
+    }
+
     private Path prepareZip() {
         String clazz1 =
                 "package jshelltest;\n" +