Fix NetplayScreen edge to edge

NetplayScreen was not drawing under the bottom nav bar like other screens. In landscape mode half of the screen scrolls and half is fixed, to make this look natural with edge to edge, provide a fade on the bottom of the scrolling side so things look natural when the screens loads and is resting at 0 scroll offset.

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/netplay/ui/NetplayScreen.kt

@@ -108,6 +108,7 @@ import org.dolphinemu.dolphinemu.ui.theme.MenuSpacer
 import org.dolphinemu.dolphinemu.ui.theme.OutlinedBox
 import org.dolphinemu.dolphinemu.ui.theme.PreviewTheme
 import org.dolphinemu.dolphinemu.ui.theme.ReadOnlyTextField
+import org.dolphinemu.dolphinemu.ui.theme.bottomFadeOverlay
 import org.dolphinemu.dolphinemu.ui.theme.rememberSheetState
 import org.dolphinemu.dolphinemu.utils.CoilUtils
 import java.util.Locale
@@ -164,7 +165,6 @@ fun NetplayScreen(
         val modifier = Modifier
             .fillMaxSize()
             .consumeWindowInsets(innerPadding)
-            .padding(innerPadding)
 
         // State which must live above the landscape/portrait split.
         var showChat by rememberSaveable { mutableStateOf(false) }
@@ -202,6 +202,7 @@ fun NetplayScreen(
                 joinAddresses = joinAddresses,
                 selectedJoinInfoType = selectedJoinInfoType,
                 onSelectedJoinInfoTypeChanged = { selectedJoinInfoType = it },
+                contentPadding = innerPadding,
                 modifier = modifier
             )
         } else {
@@ -227,6 +228,7 @@ fun NetplayScreen(
                 joinAddresses = joinAddresses,
                 selectedJoinInfoType = selectedJoinInfoType,
                 onSelectedJoinInfoTypeChanged = { selectedJoinInfoType = it },
+                contentPadding = innerPadding,
                 modifier = modifier
             )
         }
@@ -344,11 +346,13 @@ private fun PortraitContent(
     joinAddresses: Map<JoinInfoType, JoinAddress>,
     selectedJoinInfoType: JoinInfoType,
     onSelectedJoinInfoTypeChanged: (JoinInfoType) -> Unit,
+    contentPadding: PaddingValues,
     modifier: Modifier = Modifier,
 ) {
     Column(
         modifier = modifier
             .verticalScroll(rememberScrollState())
+            .padding(contentPadding)
     ) {
         Chat(
             messages = messages,
@@ -414,11 +418,11 @@ private fun LandscapeContent(
     joinAddresses: Map<JoinInfoType, JoinAddress>,
     selectedJoinInfoType: JoinInfoType,
     onSelectedJoinInfoTypeChanged: (JoinInfoType) -> Unit,
+    contentPadding: PaddingValues,
     modifier: Modifier = Modifier,
 ) {
     Row(
         modifier = modifier
-            .padding(horizontal = DolphinTheme.scaffoldPadding)
     ) {
         Chat(
             messages = messages,
@@ -426,16 +430,26 @@ private fun LandscapeContent(
             showBottomSheet = showChat,
             onShowBottomSheetChanged = onShowChatChanged,
             modifier = Modifier
+                .padding(contentPadding)
+                .padding(
+                    start = DolphinTheme.scaffoldPadding,
+                    end = DolphinTheme.scaffoldPadding / 2,
+                )
                 .weight(1f)
                 .fillMaxHeight()
         )
 
-        Spacer(modifier = Modifier.width(16.dp))
+        val scrollState = rememberScrollState()
-
         Column(
             modifier = Modifier
                 .weight(1f)
-                .verticalScroll(rememberScrollState())
+                .bottomFadeOverlay(scrollState, contentPadding.calculateBottomPadding())
+                .verticalScroll(scrollState)
+                .padding(contentPadding)
+                .padding(
+                    start = DolphinTheme.scaffoldPadding / 2,
+                    end = DolphinTheme.scaffoldPadding
+                )
         ) {
             PlayersAndSettings(
                 game = game,

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/ui/theme/DolphinTheme.kt

@@ -5,11 +5,13 @@ package org.dolphinemu.dolphinemu.ui.theme
 import android.content.Context
 import androidx.annotation.AttrRes
 import androidx.compose.foundation.LocalIndication
+import androidx.compose.foundation.ScrollState
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
@@ -28,10 +30,15 @@ import androidx.compose.material3.Text
 import androidx.compose.material3.darkColorScheme
 import androidx.compose.material3.lightColorScheme
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.derivedStateOf
+import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
+import androidx.compose.ui.draw.drawWithContent
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.geometry.Size
 import androidx.compose.ui.graphics.Brush
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalContext
@@ -286,3 +293,45 @@ fun rememberSheetState(
         )
     }
 }
+
+@Composable
+fun Modifier.bottomFadeOverlay(
+    scrollState: ScrollState,
+    fadeHeight: Dp,
+): Modifier {
+    val surfaceColor = MaterialTheme.colorScheme.surface
+    val bottomPaddingPx = with(LocalDensity.current) {
+        fadeHeight.toPx()
+    }
+    val fadeDelayPx = with(LocalDensity.current) { 8.dp.toPx() }
+    val fadeDurationPx = with(LocalDensity.current) { 48.dp.toPx() }
+    val scrollProgress by remember {
+        derivedStateOf {
+            if (bottomPaddingPx <= 0f) 1f
+            else ((scrollState.value.coerceAtLeast(0) - fadeDelayPx) / fadeDurationPx)
+                .coerceIn(0f, 1f)
+        }
+    }
+    val surfaceStopFraction = (scrollProgress * 2f).coerceIn(0f, 1f)
+    val transparentStopFraction = ((scrollProgress * 2f) - 1f).coerceIn(0f, 1f)
+
+    return drawWithContent {
+        drawContent()
+        if (transparentStopFraction < 1f) {
+            drawRect(
+                brush = Brush.verticalGradient(
+                    colorStops = arrayOf(
+                        0f to Color.Transparent,
+                        transparentStopFraction to Color.Transparent,
+                        surfaceStopFraction to surfaceColor,
+                        1f to surfaceColor,
+                    ),
+                    startY = size.height - bottomPaddingPx,
+                    endY = size.height,
+                ),
+                topLeft = Offset(0f, size.height - bottomPaddingPx),
+                size = Size(size.width, bottomPaddingPx),
+            )
+        }
+    }
+}