Let the composer takes at max half of the available height. The value will be different if the soft keyboard is displayed or not.

Closes #3851

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/MessagesView.kt

@@ -29,10 +29,15 @@ import androidx.compose.foundation.layout.systemBarsPadding
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableIntStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.shadow
 import androidx.compose.ui.graphics.RectangleShape
+import androidx.compose.ui.layout.onSizeChanged
 import androidx.compose.ui.platform.LocalView
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.semantics.Role
@@ -82,6 +87,7 @@ import io.element.android.libraries.designsystem.components.rememberExpandableBo
 import io.element.android.libraries.designsystem.preview.ElementPreview
 import io.element.android.libraries.designsystem.preview.PreviewsDayNight
 import io.element.android.libraries.designsystem.text.toAnnotatedString
+import io.element.android.libraries.designsystem.text.toDp
 import io.element.android.libraries.designsystem.theme.components.BottomSheetDragHandle
 import io.element.android.libraries.designsystem.theme.components.Scaffold
 import io.element.android.libraries.designsystem.theme.components.Text
@@ -129,6 +135,8 @@ fun MessagesView(
 
     val snackbarHostState = rememberSnackbarHostState(snackbarMessage = state.snackbarMessage)
 
+    var maxComposerHeightPx by remember { mutableIntStateOf(120) }
+
     // This is needed because the composer is inside an AndroidView that can't be affected by the FocusManager in Compose
     val localView = LocalView.current
 
@@ -179,7 +187,13 @@ fun MessagesView(
         modifier = modifier
             .fillMaxSize()
             .imePadding()
-            .systemBarsPadding(),
+            .systemBarsPadding()
+            .onSizeChanged { size ->
+                // Let the composer takes at max half of the available height.
+                // The value will be different if the soft keyboard is displayed
+                // or not.
+                maxComposerHeightPx = (size.height * 0.5f).toInt()
+            },
         content = {
             Scaffold(
                 contentWindowInsets = WindowInsets.statusBars,
@@ -313,7 +327,7 @@ fun MessagesView(
         } else {
             RectangleShape
         },
-        maxBottomSheetContentHeight = 360.dp,
+        maxBottomSheetContentHeight = maxComposerHeightPx.toDp(),
     )
 
     ActionListView(