Unhide --experimental_ui_actions_shown

--
Change-Id: I1b8acc9dbd73ede3952a51f3f67b32e1b7e536a2
Reviewed-on: https://bazel-review.googlesource.com/#/c/3900
MOS_MIGRATED_REVID=125957281

2 files changed, 11 insertions, 3 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/runtime/BlazeCommandEventHandler.java b/src/main/java/com/google/devtools/build/lib/runtime/BlazeCommandEventHandler.java
index 8ef6dbea1e..f322394f66 100644
--- a/src/main/java/com/google/devtools/build/lib/runtime/BlazeCommandEventHandler.java
+++ b/src/main/java/com/google/devtools/build/lib/runtime/BlazeCommandEventHandler.java
@@ -160,8 +160,12 @@ public class BlazeCommandEventHandler implements EventHandler {
     @Option(
       name = "experimental_ui_actions_shown",
       defaultValue = "3",
-      category = "hidden",
-      help = "Number of concurrent actions shown in the experimental new Bazel UI."
+      category = "verbosity",
+      help =
+          "Number of concurrent actions shown in the alternative progress bar; each "
+              + "action is shown on a separate line. The alternative progress bar always shows "
+              + "at least one one, all numbers less than 1 are mapped to 1. "
+              + "This option has no effect unless --experimental_ui is set."
     )
     public int experimentalUiActionsShown;
 
diff --git a/src/main/java/com/google/devtools/build/lib/runtime/ExperimentalStateTracker.java b/src/main/java/com/google/devtools/build/lib/runtime/ExperimentalStateTracker.java
index 2661243a27..03e894100b 100644
--- a/src/main/java/com/google/devtools/build/lib/runtime/ExperimentalStateTracker.java
+++ b/src/main/java/com/google/devtools/build/lib/runtime/ExperimentalStateTracker.java
@@ -106,7 +106,11 @@ class ExperimentalStateTracker {
    * Set the maximal number of actions shown in the progress bar.
    */
   void setSampleSize(int sampleSize) {
-    this.sampleSize = sampleSize;
+    if (sampleSize >= 1) {
+      this.sampleSize = sampleSize;
+    } else {
+      this.sampleSize = 1;
+    }
   }
 
   void buildStarted(BuildStartingEvent event) {