Fix insets on API < 29

app/src/main/kotlin/com/hippo/ehviewer/util/WindowInsetsUtil.kt

@@ -1,5 +1,6 @@
 package com.hippo.ehviewer.util
 
+import android.graphics.Rect
 import android.view.View
 import androidx.compose.foundation.layout.WindowInsets
 import androidx.compose.runtime.Composable
@@ -13,7 +14,21 @@ import kotlin.contracts.contract
 
 inline fun buildWindowInsets(builderAction: WindowInsetsCompat.Builder.() -> Unit): WindowInsetsCompat {
     contract { callsInPlace(builderAction, InvocationKind.EXACTLY_ONCE) }
-    val builder = WindowInsetsCompat.Builder()
+    val builder = if (isAtLeastQ) {
+        WindowInsetsCompat.Builder()
+    } else {
+        // TODO: Report to google issue tracker
+        // On API 20-28, WindowInsetsCompat.Builder() will copy the WindowInsets.CONSUMED static field,
+        // which isConsumed() returns true, resulting in the insets not being dispatched
+        runCatching {
+            val constructor = android.view.WindowInsets::class.java.getConstructor(Rect::class.java)
+            val platformInsets = constructor.newInstance(Rect())
+            WindowInsetsCompat.Builder(WindowInsetsCompat.toWindowInsetsCompat(platformInsets))
+        }.getOrElse {
+            it.printStackTrace()
+            WindowInsetsCompat.Builder()
+        }
+    }
     builder.builderAction()
     return builder.build()
 }