fix : hide keyboard when TextComposer is removed from composition

libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/utils/HideKeyboardWhenDisposed.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2024 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Please see LICENSE in the repository root for full details.
+ */
+
+package io.element.android.libraries.designsystem.utils
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.ui.platform.LocalSoftwareKeyboardController
+
+@Composable
+fun HideKeyboardWhenDisposed() {
+    val keyboardController = LocalSoftwareKeyboardController.current
+    DisposableEffect(Unit) {
+        onDispose {
+            keyboardController?.hide()
+        }
+    }
+}

libraries/textcomposer/impl/src/main/kotlin/io/element/android/libraries/textcomposer/TextComposer.kt

@@ -47,6 +47,7 @@ import io.element.android.libraries.designsystem.preview.PreviewsDayNight
 import io.element.android.libraries.designsystem.theme.components.CircularProgressIndicator
 import io.element.android.libraries.designsystem.theme.components.Icon
 import io.element.android.libraries.designsystem.theme.components.Text
+import io.element.android.libraries.designsystem.utils.HideKeyboardWhenDisposed
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.timeline.item.event.EventOrTransactionId
 import io.element.android.libraries.matrix.api.timeline.item.event.toEventOrTransactionId
@@ -323,6 +324,7 @@ fun TextComposer(
             }
         }
     }
+    HideKeyboardWhenDisposed()
 }
 
 @Composable