2109 - avoid unnecessary repaints

We're still seeing mu hang for long periods if people press and hold say
an arrow key, as the events are all processed. Hopefully this will stop
that from taking too long.

But the real problem is still printing junk to screen because of
sluggishness in processing input.

1 files changed, 6 insertions, 0 deletions

diff --git a/edit.mu b/edit.mu
index 34356efd..a8781162 100644
--- a/edit.mu
+++ b/edit.mu
@@ -4579,6 +4579,9 @@ recipe event-loop [
         screen, recipes, render?:boolean <- handle-keyboard-event screen, recipes, e:event
         {
           break-unless render?
+          # optimization: refresh screen only if no more events
+          more-events?:boolean <- has-more-events? console
+          break-if more-events?
           screen <- render-recipes screen, env
         }
       }
@@ -4587,6 +4590,9 @@ recipe event-loop [
         screen, current-sandbox, render?:boolean <- handle-keyboard-event screen, current-sandbox, e:event
         {
           break-unless render?:boolean
+          # optimization: refresh screen only if no more events
+          more-events?:boolean <- has-more-events? console
+          break-if more-events?
           screen <- render-sandbox-side screen, env
         }
       }