Fix WindowSizeClass breakpoint compat

app/src/minApi23/java/io/nekohasekai/sfa/compat/WindowSizeClassCompat.kt

@@ -0,0 +1,10 @@
+package io.nekohasekai.sfa.compat
+
+import androidx.window.core.layout.WindowSizeClass
+
+object WindowSizeClassCompat {
+    const val WIDTH_DP_MEDIUM_LOWER_BOUND = 600
+    const val WIDTH_DP_EXPANDED_LOWER_BOUND = 840
+}
+
+fun WindowSizeClass.isWidthAtLeastBreakpointCompat(breakpointDp: Int): Boolean = isWidthAtLeastBreakpoint(breakpointDp)