Added grid column count settings

*Cough, cough* Use pinch to zoom gesture instead, not a fan of this.

app/src/main/java/com/topjohnwu/magisk/redesign/settings/SettingsItems.kt

@@ -16,6 +16,8 @@ import com.topjohnwu.magisk.model.entity.recycler.SettingsItem
 import com.topjohnwu.magisk.utils.*
 import com.topjohnwu.superuser.Shell
 import java.io.File
+import kotlin.math.max
+import kotlin.math.min
 
 // --- Customization
 
@@ -122,6 +124,22 @@ object DownloadPath : SettingsItem.Input() {
         .inflate(LayoutInflater.from(context)).also { it.data = this }.root
 }
 
+object GridSize : SettingsItem.Selector() {
+    override var value by dataObservable(Config.listSpanCount - 1) {
+        Config.listSpanCount = max(1, min(3, it + 1))
+    }
+
+    override val title = R.string.settings_grid_span_count_title.asTransitive()
+    override val description = R.string.settings_grid_span_count_summary.asTransitive()
+
+    init {
+        setValues(
+            resources.getStringArray(R.array.span_count),
+            resources.getStringArray(R.array.value_array)
+        )
+    }
+}
+
 object UpdateChannel : SettingsItem.Selector() {
     override var value by dataObservable(Config.updateChannel) { Config.updateChannel = it }
     override val title = R.string.settings_update_channel_title.asTransitive()

app/src/main/java/com/topjohnwu/magisk/redesign/settings/SettingsViewModel.kt

@@ -35,7 +35,7 @@ class SettingsViewModel(
     val itemBinding = itemBindingOf<SettingsItem> { it.bindExtra(BR.callback, this) }
     val items = diffListOf(
         Customization,
-        Theme, Language, Redesign, DownloadPath,
+        Theme, Language, Redesign, DownloadPath, GridSize,
 
         Manager,
         UpdateChannel, UpdateChannelUrl, ClearRepoCache, HideOrRestore(), UpdateChecker,