Add workaround for disappearing menu items

app/src/main/java/eu/kanade/tachiyomi/ui/base/controller/BaseController.kt

@@ -1,8 +1,10 @@
 package eu.kanade.tachiyomi.ui.base.controller
 
 import android.os.Bundle
+import android.support.v4.view.MenuItemCompat
 import android.support.v7.app.AppCompatActivity
 import android.view.LayoutInflater
+import android.view.MenuItem
 import android.view.View
 import android.view.ViewGroup
 import com.bluelinelabs.conductor.ControllerChangeHandler
@@ -44,4 +46,23 @@ abstract class BaseController(bundle: Bundle? = null) : RestoreViewOnCreateContr
         (activity as? AppCompatActivity)?.supportActionBar?.title = getTitle()
     }
 
+    /**
+     * Workaround for disappearing menu items when collapsing an expandable item like a SearchView.
+     * This method should be removed when fixed upstream.
+     * Issue link: https://issuetracker.google.com/issues/37657375
+     */
+    fun MenuItem.fixExpand() {
+        val expandListener = object : MenuItemCompat.OnActionExpandListener {
+            override fun onMenuItemActionExpand(item: MenuItem): Boolean {
+                return true
+            }
+
+            override fun onMenuItemActionCollapse(item: MenuItem): Boolean {
+                activity?.invalidateOptionsMenu()
+                return true
+            }
+        }
+        MenuItemCompat.setOnActionExpandListener(this, expandListener)
+    }
+
 }

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt

@@ -346,6 +346,8 @@ class LibraryController(
             query = it.toString()
             searchRelay.call(query)
         }
+
+        searchItem.fixExpand()
     }
 
     override fun onPrepareOptionsMenu(menu: Menu) {