fix: the Android keyboard opens on the first tap after the system dismissed it (#665)

app/src/main/java/com/droiddeck/launcher/input/KeyboardHost.kt

@@ -2,10 +2,12 @@ package com.droiddeck.launcher.input
 
 import android.app.Activity
 import android.content.Context
+import android.os.Build
 import android.text.InputType
 import android.view.KeyCharacterMap
 import android.view.KeyEvent
 import android.view.View
+import android.view.WindowInsets
 import android.view.inputmethod.BaseInputConnection
 import android.view.inputmethod.EditorInfo
 import android.view.inputmethod.InputConnection
@@ -53,7 +55,10 @@ class KeyboardHost(
         return KeyConnection()
     }
 
-    fun toggle() = if (shown) hide() else show()
+    fun toggle() = if (shown && imeVisible()) hide() else show()
+
+    private fun imeVisible() = Build.VERSION.SDK_INT < Build.VERSION_CODES.R ||
+        rootWindowInsets?.isVisible(WindowInsets.Type.ime()) != false
 
     fun show() {
         shown = true

app/src/test/java/com/droiddeck/launcher/input/KeyboardHostTest.kt

@@ -0,0 +1,55 @@
+package com.droiddeck.launcher.input
+
+import android.app.Activity
+import android.content.Context
+import android.os.Looper
+import android.view.inputmethod.InputMethodManager
+import android.widget.FrameLayout
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.Robolectric
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.Shadows.shadowOf
+import org.robolectric.annotation.Config
+
+@RunWith(RobolectricTestRunner::class)
+@Config(manifest = Config.NONE)
+class KeyboardHostTest {
+    private lateinit var imm: InputMethodManager
+    private lateinit var host: KeyboardHost
+
+    @Before fun setUp() {
+        val activity = Robolectric.buildActivity(Activity::class.java).setup().get()
+        imm = activity.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
+        host = KeyboardHost(activity)
+        activity.setContentView(FrameLayout(activity).apply { addView(host) })
+        idle()
+    }
+
+    @Config(sdk = [33])
+    @Test fun toggleShowsAKeyboardTheSystemDismissed() {
+        host.show()
+        idle()
+        imm.hideSoftInputFromWindow(host.windowToken, 0)
+        idle()
+        host.toggle()
+        idle()
+        assertTrue(shadowOf(imm).isSoftInputVisible)
+        assertTrue(host.shown)
+    }
+
+    @Config(sdk = [28])
+    @Test fun toggleHidesAKeyboardThatIsShowing() {
+        host.show()
+        idle()
+        host.toggle()
+        idle()
+        assertFalse(shadowOf(imm).isSoftInputVisible)
+        assertFalse(host.shown)
+    }
+
+    private fun idle() = shadowOf(Looper.getMainLooper()).idle()
+}