Revert "TextEditor: Hide LineNumberFilter implementation"

Fixes missing "Line in Current Document" locator filter.
Locator filters need to be created during startup.

This reverts commit 8af6d16b6c.

Change-Id: I53ec1c1079b4a719169e8db95b6d77f703264b65
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/texteditor/texteditorplugin.cpp

@@ -99,6 +99,7 @@ public:
     FilePath m_marginActionFileName;
 
     TextEditorSettings settings;
+    LineNumberFilter lineNumberFilter; // Goto line functionality for quick open
     OutlineFactory outlineFactory;
 
     FindInFiles findInFilesFilter;
@@ -425,6 +426,11 @@ void TextEditorPlugin::extensionsInitialized()
                                });
 }
 
+LineNumberFilter *TextEditorPlugin::lineNumberFilter()
+{
+    return &m_instance->d->lineNumberFilter;
+}
+
 ExtensionSystem::IPlugin::ShutdownFlag TextEditorPlugin::aboutToShutdown()
 {
     Highlighter::handleShutdown();