refactor: Remove most raw accesses into Application (#5104)

src/controllers/completion/TabCompletionModel.cpp

@@ -38,8 +38,9 @@ void TabCompletionModel::updateResults(const QString &query,
 #ifdef CHATTERINO_HAVE_PLUGINS
         // Try plugins first
         bool done{};
-        std::tie(done, results) = getApp()->plugins->updateCustomCompletions(
-            query, fullTextContent, cursorPosition, isFirstWord);
+        std::tie(done, results) =
+            getIApp()->getPlugins()->updateCustomCompletions(
+                query, fullTextContent, cursorPosition, isFirstWord);
         if (done)
         {
             this->setStringList(results);

src/controllers/completion/sources/CommandSource.cpp

@@ -71,7 +71,7 @@ void CommandSource::initializeItems()
     std::vector<CommandItem> commands;
 
 #ifdef CHATTERINO_HAVE_PLUGINS
-    for (const auto &command : getApp()->commands->pluginCommands())
+    for (const auto &command : getIApp()->getCommands()->pluginCommands())
     {
         addCommand(command, commands);
     }