fix: round OS widget corners for API level < 31

Author: jvsena42

app/src/main/java/to/bitkit/appwidget/ui/components/GlanceWidgetScaffold.kt

@@ -4,14 +4,14 @@ import android.content.Intent
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.unit.dp
 import androidx.glance.GlanceModifier
+import androidx.glance.ImageProvider
 import androidx.glance.action.clickable
 import androidx.glance.appwidget.action.actionStartActivity
-import androidx.glance.appwidget.cornerRadius
 import androidx.glance.background
 import androidx.glance.layout.Column
 import androidx.glance.layout.fillMaxSize
 import androidx.glance.layout.padding
-import to.bitkit.appwidget.ui.theme.GlanceColors
+import to.bitkit.R
 
 @Composable
 fun GlanceWidgetScaffold(
@@ -20,8 +20,7 @@ fun GlanceWidgetScaffold(
 ) {
     val modifier = GlanceModifier
         .fillMaxSize()
-        .cornerRadius(16.dp)
-        .background(GlanceColors.cardBackgroundProvider)
+        .background(ImageProvider(R.drawable.appwidget_background))
         .padding(16.dp)
         .let { mod ->
             if (onClick != null) mod.clickable(actionStartActivity(onClick)) else mod

app/src/main/java/to/bitkit/appwidget/ui/theme/GlanceColors.kt

@@ -4,7 +4,6 @@ import androidx.glance.color.ColorProvider
 import to.bitkit.ui.theme.Colors
 
 object GlanceColors {
-    val cardBackgroundProvider = ColorProvider(day = Colors.Gray5, night = Colors.Gray5)
     val textPrimary = ColorProvider(day = Colors.White, night = Colors.White)
     val textSecondary = ColorProvider(day = Colors.White64, night = Colors.White64)
     val textTertiary = ColorProvider(day = Colors.White50, night = Colors.White50)

app/src/main/res/drawable/appwidget_background.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <corners android:radius="16dp" />
+    <solid android:color="@color/gray5" />
+</shape>