fix(set-due-date): show snackbar after IME hidden

Otherwise it may appears in the middle of the screen

Some of Issue 19915: snackbar obscured answer button

Author: david-allison

AnkiDroid/src/main/java/com/ichi2/anki/scheduling/SetDueDateDialog.kt

@@ -57,6 +57,7 @@ import com.ichi2.anki.servicelayer.getFSRSStatus
 import com.ichi2.anki.showThemedToast
 import com.ichi2.anki.snackbar.showSnackbar
 import com.ichi2.anki.ui.internationalization.toSentenceCase
+import com.ichi2.anki.utils.doOnImeHidden
 import com.ichi2.anki.utils.openUrl
 import com.ichi2.anki.withProgress
 import com.ichi2.utils.AndroidUiUtils
@@ -430,7 +431,10 @@ private fun AnkiActivity.updateDueDate(
             return@asyncCatching null
         }
         Timber.d("updated %d cards", cardsUpdated)
-        showSnackbar(TR.schedulingSetDueDateDone(cardsUpdated), Snackbar.LENGTH_SHORT)
+        // Ensure the snackbar doesn't appear in the middle of the screen
+        doOnImeHidden {
+            showSnackbar(TR.schedulingSetDueDateDone(cardsUpdated), Snackbar.LENGTH_SHORT)
+        }
         return@asyncCatching cardsUpdated
     }
 

AnkiDroid/src/main/java/com/ichi2/anki/utils/AndroidUtils.kt

@@ -25,6 +25,9 @@ import android.view.inputmethod.InputMethodManager
 import androidx.annotation.StringRes
 import androidx.core.content.ContextCompat
 import androidx.core.net.toUri
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+import androidx.core.view.WindowInsetsControllerCompat
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.FragmentActivity
 import com.ichi2.anki.AnkiDroidApp
@@ -136,3 +139,38 @@ fun View.hideKeyboard() {
     val imm = context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
     imm.hideSoftInputFromWindow(windowToken, 0)
 }
+
+/**
+ * Hides the IME, and runs [block] after the operation completes
+ *
+ * [block] may be executed immediately if the IME is already hidden
+ *
+ * @param block the code to run after the IME is hidden. Run at most once
+ */
+fun FragmentActivity.doOnImeHidden(block: () -> Unit) {
+    val view = window.decorView
+    WindowInsetsControllerCompat(window, view).hide(WindowInsetsCompat.Type.ime())
+
+    var blockHasRun = false
+
+    fun runBlockOnce() {
+        if (blockHasRun) return
+        blockHasRun = true
+        Timber.v("IME hidden. executing...")
+        block()
+    }
+
+    ViewCompat.setOnApplyWindowInsetsListener(view) { _, insets ->
+        val imeVisible = insets.isVisible(WindowInsetsCompat.Type.ime())
+
+        if (!imeVisible) {
+            ViewCompat.setOnApplyWindowInsetsListener(view, null)
+            runBlockOnce()
+        }
+
+        insets
+    }
+
+    // ensure the block is run immediately if the IME is already hidden
+    ViewCompat.requestApplyInsets(view)
+}