karm-ui: Fixed high CPU usage.

src/impls/impl-sdl/ui.cpp

@@ -523,7 +523,7 @@ struct SdlHost :
         // NOTE: A better option would be to have SDL in a separeted thread
         //       and do the communication over an inter-thread channel but
         //       but this would require to make the Framework thread safe
-        auto delay = TimeSpan::fromMSecs((usize)(FRAME_TIME * 1000 * 2));
+        auto delay = TimeSpan::fromMSecs((usize)(FRAME_TIME * 1000));
         auto cappedWait = min(ts, Sys::now() + delay);
         try$(Sys::globalSched().wait(cappedWait));
 

src/libs/karm-io/fmt.h

@@ -895,7 +895,7 @@ struct Formatter<char const *> : public StringFormatter<Utf8> {
 template <>
 struct Formatter<TimeSpan> {
     Res<usize> format(Io::TextWriter &writer, TimeSpan const &val) {
-        return Io::format(writer, "{}.{03}s", val.toSecs(), val.toUSecs() % 1000);
+        return Io::format(writer, "{}.{03}s", val.toSecs(), val.toMSecs() % 1000);
     }
 };
 

src/libs/karm-ui/host.h

@@ -280,7 +280,8 @@ struct Host : public Node {
             if (_dirty.len() > 0)
                 doPaint();
 
-            try$(wait(nextFrame));
+            try$(wait(nextFrameScheduled ? nextFrame : TimeStamp::endOfTime()));
+            nextFrameScheduled = false;
         }
 
         return _res.unwrap();