Compose. Hot keys didn't work until we clicked on the window.

This is because we add listeners to Canvas, but at window start we take focus on parent JPanel.
We can't add listeners to JPanel, because Canvas will eat all events anyway.

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/SkiaLayer.kt

@@ -9,12 +9,14 @@ import org.jetbrains.skiko.context.ContextHandler
 import org.jetbrains.skiko.context.createContextHandler
 import org.jetbrains.skiko.redrawer.Redrawer
 import java.awt.Graphics
+import java.awt.event.FocusEvent
 import java.awt.event.HierarchyEvent
 import java.awt.event.InputMethodListener
 import java.awt.event.KeyListener
 import java.awt.event.MouseListener
 import java.awt.event.MouseMotionListener
 import java.awt.event.MouseWheelListener
+import java.awt.im.InputMethodRequests
 import javax.swing.JPanel
 import javax.swing.SwingUtilities.isEventDispatchThread
 
@@ -44,6 +46,10 @@ open class SkiaLayer(
                 // 3. to avoid double paint in one single frame, use needRedraw instead of redrawImmediately
                 redrawer?.needRedraw()
             }
+
+            override fun getInputMethodRequests(): InputMethodRequests? {
+                return this@SkiaLayer.inputMethodRequests
+            }
         }
         add(backedLayer)
         @Suppress("LeakingThis")
@@ -146,6 +152,25 @@ open class SkiaLayer(
         }
     }
 
+    // We need to delegate all event listeners to the Canvas (so and focus/input)
+    // Canvas is heavyweight AWT component, JPanel is lightweight Swing component
+    // Event handling doesn't properly work when we mix heavyweight and lightweight components.
+    // For example, Canvas will eat all mouse events
+    // (see "mouse events on a heavyweight component do not fall through to its parent",
+    // https://www.comp.nus.edu.sg/~cs3283/ftp/Java/swingConnect/archive/tech_topics_arch/mixing/mixing.html)
+
+    override fun enableInputMethods(enable: Boolean) {
+        backedLayer.enableInputMethods(enable)
+    }
+
+    override fun requestFocus() {
+        backedLayer.requestFocus()
+    }
+
+    override fun requestFocus(cause: FocusEvent.Cause?) {
+        backedLayer.requestFocus(cause)
+    }
+
     override fun addInputMethodListener(l: InputMethodListener) {
         backedLayer.addInputMethodListener(l)
     }
@@ -186,8 +211,6 @@ open class SkiaLayer(
         backedLayer.removeKeyListener(l)
     }
 
-    private var redrawScheduled = false
-
     /**
      * Redraw on the next animation Frame (on vsync signal if vsync is enabled).
      */