Add an option for the number of actions shown in the experimental UI

Currently, the experimental UI always shows the 3 oldest, still running actions.
While this seems a reasonable default, some users requested to be able to change
the number of actions shown. Hence replace the hard-coded value by a flag.

While there, also fix an off-by-one error in deciding when to put the ellipsis
symbol.

--
Change-Id: I037d208360fa1d3f100c99ab1ab1f5fc140138ac
Reviewed-on: https://bazel-review.googlesource.com/#/c/3811
MOS_MIGRATED_REVID=125427168

1 files changed, 7 insertions, 0 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 635a4561a0..85fb3fa45c 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
@@ -157,6 +157,13 @@ public class BlazeCommandEventHandler implements EventHandler {
     )
     public boolean experimentalUiDebugAllEvents;
 
+    @Option(
+      name = "experimental_ui_actions_shown",
+      defaultValue = "3",
+      category = "hidden",
+      help = "Number of concurrent actions shown in the experimental new Bazel UI."
+    )
+    public int experimentalUiActionsShown;
 
     public boolean useColor() {
       return useColorEnum == UseColor.YES || (useColorEnum == UseColor.AUTO && isATty);