UI: Add undo/redo to Paste Filters on audio mixer and scenes

Copy-Pasting filters on a scene or on a source via the audio mixer
context menu would not add an undo/redo action. This commit factors the
undo/redo logic out into a generic paste filters function that can be
used for pasting filters everywhere.

UI/window-basic-main.cpp

@@ -10107,6 +10107,26 @@ void OBSBasic::on_actionPasteDup_triggered()
 				  redo_data);
 }
 
+void OBSBasic::SourcePasteFilters(OBSSource source, OBSSource dstSource)
+{
+	if (source == dstSource)
+		return;
+
+	OBSDataArrayAutoRelease undo_array =
+		obs_source_backup_filters(dstSource);
+	obs_source_copy_filters(dstSource, source);
+	OBSDataArrayAutoRelease redo_array =
+		obs_source_backup_filters(dstSource);
+
+	const char *srcName = obs_source_get_name(source);
+	const char *dstName = obs_source_get_name(dstSource);
+	QString text =
+		QTStr("Undo.Filters.Paste.Multiple").arg(srcName, dstName);
+
+	CreateFilterPasteUndoRedoAction(text, dstSource, undo_array,
+					redo_array);
+}
+
 void OBSBasic::AudioMixerCopyFilters()
 {
 	QAction *action = reinterpret_cast<QAction *>(sender());
@@ -10126,10 +10146,7 @@ void OBSBasic::AudioMixerPasteFilters()
 	OBSSourceAutoRelease source =
 		obs_weak_source_get_source(copyFiltersSource);
 
-	if (source == dstSource)
-		return;
-
-	obs_source_copy_filters(dstSource, source);
+	SourcePasteFilters(source.Get(), dstSource);
 }
 
 void OBSBasic::SceneCopyFilters()
@@ -10145,10 +10162,7 @@ void OBSBasic::ScenePasteFilters()
 
 	OBSSource dstSource = GetCurrentSceneSource();
 
-	if (source == dstSource)
-		return;
-
-	obs_source_copy_filters(dstSource, source);
+	SourcePasteFilters(source.Get(), dstSource);
 }
 
 void OBSBasic::on_actionCopyFilters_triggered()
@@ -10206,22 +10220,7 @@ void OBSBasic::on_actionPasteFilters_triggered()
 	OBSSceneItem sceneItem = GetCurrentSceneItem();
 	OBSSource dstSource = obs_sceneitem_get_source(sceneItem);
 
-	if (source == dstSource)
-		return;
-
-	OBSDataArrayAutoRelease undo_array =
-		obs_source_backup_filters(dstSource);
-	obs_source_copy_filters(dstSource, source);
-	OBSDataArrayAutoRelease redo_array =
-		obs_source_backup_filters(dstSource);
-
-	const char *srcName = obs_source_get_name(source);
-	const char *dstName = obs_source_get_name(dstSource);
-	QString text =
-		QTStr("Undo.Filters.Paste.Multiple").arg(srcName, dstName);
-
-	CreateFilterPasteUndoRedoAction(text, dstSource, undo_array,
-					redo_array);
+	SourcePasteFilters(source.Get(), dstSource);
 }
 
 static void ConfirmColor(SourceTree *sources, const QColor &color,

UI/window-basic-main.hpp

@@ -803,6 +803,9 @@ private slots:
 
 	void on_actionCopyFilters_triggered();
 	void on_actionPasteFilters_triggered();
+	void AudioMixerCopyFilters();
+	void AudioMixerPasteFilters();
+	void SourcePasteFilters(OBSSource source, OBSSource dstSource);
 
 	void ColorChange();
 
@@ -810,9 +813,6 @@ private slots:
 
 	void on_actionShowAbout_triggered();
 
-	void AudioMixerCopyFilters();
-	void AudioMixerPasteFilters();
-
 	void EnablePreview();
 	void DisablePreview();