diff --git a/aegisub/src/base_grid.cpp b/aegisub/src/base_grid.cpp
index 6af26c24f..8f134143b 100644
--- a/aegisub/src/base_grid.cpp
+++ b/aegisub/src/base_grid.cpp
@@ -1077,6 +1077,13 @@ void BaseGrid::SetActiveLine(AssDialogue *new_line) {
 	}
 }
 
+void BaseGrid::SetSelectionAndActive(Selection const& new_selection, AssDialogue *new_line) {
+	BeginBatch();
+	SetSelectedSet(new_selection);
+	SetActiveLine(new_line);
+	EndBatch();
+}
+
 void BaseGrid::PrevLine() {
 	int cur_line_i = GetDialogueIndex(GetActiveLine());
 	if (AssDialogue *prev_line = GetDialogue(cur_line_i-1)) {
diff --git a/aegisub/src/base_grid.h b/aegisub/src/base_grid.h
index 3bbcbf3be..839c7f550 100644
--- a/aegisub/src/base_grid.h
+++ b/aegisub/src/base_grid.h
@@ -149,6 +149,7 @@ public:
 	void SetSelectedSet(const Selection &new_selection);
 	void GetSelectedSet(Selection &res) const { res = selection; }
 	Selection const& GetSelectedSet() const { return selection; }
+	void SetSelectionAndActive(Selection const& new_selection, AssDialogue *new_line);;
 	void NextLine();
 	void PrevLine();
 
diff --git a/aegisub/src/selection_controller.h b/aegisub/src/selection_controller.h
index d9a0751a4..affaba7a3 100644
--- a/aegisub/src/selection_controller.h
+++ b/aegisub/src/selection_controller.h
@@ -129,6 +129,15 @@ public:
 	/// @return The selected set
 	virtual Selection const& GetSelectedSet() const = 0;
 
+	/// @brief Set both the selected set and active line
+	/// @param new_line Subtitle line to become the new active line
+	/// @param new_selection The set of subtitle lines to become the new selected set
+	///
+	/// This sets both the active line and selected set before announcing the
+	/// change to either of them, and is guaranteed to announce the active line
+	/// change before the selection change.
+	virtual void SetSelectionAndActive(Selection const& new_selection, ItemDataType *new_line) = 0;
+
 	/// @brief Change the active line to the next in sequence
 	///
 	/// If there is no logical next line in sequence, no change happens. This should
@@ -212,6 +221,7 @@ public:
 	virtual ItemDataType * GetActiveLine() const { return 0; }
 	virtual void SetSelectedSet(const Selection &new_selection) { }
 	virtual void GetSelectedSet(Selection &selection) const { }
+	virtual void SetSelectionAndActive(Selection const& new_selection, ItemDataType *new_line) { }
 	virtual void NextLine() { }
 	virtual void PrevLine() { }
 	virtual void AddSelectionListener(SelectionListener<ItemDataType> *listener) { }