fix: prevent back presses during installation

Author: Axelen123

app/src/main/java/app/revanced/manager/ui/screen/PatcherScreen.kt

@@ -55,6 +55,7 @@ import app.revanced.manager.ui.model.StepCategory
 import app.revanced.manager.ui.viewmodel.PatcherViewModel
 import app.revanced.manager.util.APK_MIMETYPE
 import app.revanced.manager.util.EventEffect
+import app.revanced.manager.util.toast
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -76,11 +77,10 @@ fun PatcherScreen(
     var showInstallPicker by rememberSaveable { mutableStateOf(false) }
     var showDismissConfirmationDialog by rememberSaveable { mutableStateOf(false) }
 
-    fun onPageBack() {
-        if(patcherSucceeded == null)
-            showDismissConfirmationDialog = true
-        else
-            onLeave()
+    fun onPageBack() = when {
+        patcherSucceeded == null -> showDismissConfirmationDialog = true
+        viewModel.isInstalling -> context.toast(context.getString(R.string.patcher_install_in_progress))
+        else -> onLeave()
     }
 
     BackHandler(onBack = ::onPageBack)

app/src/main/res/values/strings.xml

@@ -318,6 +318,7 @@
     <string name="patcher_notification_text">Tap to return to the patcher</string>
     <string name="patcher_stop_confirm_title">Stop patcher</string>
     <string name="patcher_stop_confirm_description">Are you sure you want to stop the patching process?</string>
+    <string name="patcher_install_in_progress">Installation is in progress. Please wait</string>
     <string name="execute_patches">Execute patches</string>
     <string name="executing_patch">Execute %s</string>
     <string name="failed_to_execute_patch">Failed to execute %s</string>