diff --git a/Userland/Applications/PixelPaint/Tools/CloneTool.cpp b/Userland/Applications/PixelPaint/Tools/CloneTool.cpp
index 63d5d580e7..5cbc4f8b90 100644
--- a/Userland/Applications/PixelPaint/Tools/CloneTool.cpp
+++ b/Userland/Applications/PixelPaint/Tools/CloneTool.cpp
@@ -114,7 +114,7 @@ void CloneTool::on_second_paint(Layer const*, GUI::PaintEvent& event)
     painter.draw_ellipse_intersecting(rect, m_marker_color, 1);
 }
 
-bool CloneTool::on_keydown(GUI::KeyEvent const& event)
+bool CloneTool::on_keydown(GUI::KeyEvent& event)
 {
     if (event.key() == KeyCode::Key_Alt && !m_is_selecting_location) {
         m_is_selecting_location = true;
diff --git a/Userland/Applications/PixelPaint/Tools/CloneTool.h b/Userland/Applications/PixelPaint/Tools/CloneTool.h
index 53fafd2c90..f120101cee 100644
--- a/Userland/Applications/PixelPaint/Tools/CloneTool.h
+++ b/Userland/Applications/PixelPaint/Tools/CloneTool.h
@@ -27,7 +27,7 @@ protected:
     virtual void on_mousedown(Layer*, MouseEvent&) override;
     virtual void on_mousemove(Layer*, MouseEvent&) override;
     virtual void on_second_paint(Layer const*, GUI::PaintEvent&) override;
-    virtual bool on_keydown(GUI::KeyEvent const&) override;
+    virtual bool on_keydown(GUI::KeyEvent&) override;
     virtual void on_keyup(GUI::KeyEvent&) override;
 
 private:
diff --git a/Userland/Applications/PixelPaint/Tools/EllipseTool.cpp b/Userland/Applications/PixelPaint/Tools/EllipseTool.cpp
index 166e9330ae..a8bab9399a 100644
--- a/Userland/Applications/PixelPaint/Tools/EllipseTool.cpp
+++ b/Userland/Applications/PixelPaint/Tools/EllipseTool.cpp
@@ -116,7 +116,7 @@ void EllipseTool::on_second_paint(Layer const* layer, GUI::PaintEvent& event)
     draw_using(painter, preview_start, preview_end, AK::max(m_thickness * m_editor->scale(), 1));
 }
 
-bool EllipseTool::on_keydown(GUI::KeyEvent const& event)
+bool EllipseTool::on_keydown(GUI::KeyEvent& event)
 {
     if (event.key() == Key_Escape && m_drawing_button != GUI::MouseButton::None) {
         m_drawing_button = GUI::MouseButton::None;
diff --git a/Userland/Applications/PixelPaint/Tools/EllipseTool.h b/Userland/Applications/PixelPaint/Tools/EllipseTool.h
index f986dae136..40a7569ec8 100644
--- a/Userland/Applications/PixelPaint/Tools/EllipseTool.h
+++ b/Userland/Applications/PixelPaint/Tools/EllipseTool.h
@@ -24,7 +24,7 @@ public:
     virtual void on_mousemove(Layer*, MouseEvent&) override;
     virtual void on_mouseup(Layer*, MouseEvent&) override;
     virtual void on_second_paint(Layer const*, GUI::PaintEvent&) override;
-    virtual bool on_keydown(GUI::KeyEvent const&) override;
+    virtual bool on_keydown(GUI::KeyEvent&) override;
     virtual GUI::Widget* get_properties_widget() override;
     virtual Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap>> cursor() override { return Gfx::StandardCursor::Crosshair; }
 
diff --git a/Userland/Applications/PixelPaint/Tools/LassoSelectTool.cpp b/Userland/Applications/PixelPaint/Tools/LassoSelectTool.cpp
index aeed055af7..41a9550203 100644
--- a/Userland/Applications/PixelPaint/Tools/LassoSelectTool.cpp
+++ b/Userland/Applications/PixelPaint/Tools/LassoSelectTool.cpp
@@ -147,7 +147,7 @@ void LassoSelectTool::on_second_paint(Layer const* layer, GUI::PaintEvent& event
     painter.stroke_path(m_preview_path, Gfx::Color::Black, 1);
 }
 
-bool LassoSelectTool::on_keydown(GUI::KeyEvent const& key_event)
+bool LassoSelectTool::on_keydown(GUI::KeyEvent& key_event)
 {
     Tool::on_keydown(key_event);
     if (key_event.key() == KeyCode::Key_Escape) {
diff --git a/Userland/Applications/PixelPaint/Tools/LassoSelectTool.h b/Userland/Applications/PixelPaint/Tools/LassoSelectTool.h
index 621134fd40..8c06b8915c 100644
--- a/Userland/Applications/PixelPaint/Tools/LassoSelectTool.h
+++ b/Userland/Applications/PixelPaint/Tools/LassoSelectTool.h
@@ -23,7 +23,7 @@ public:
     virtual void on_mousedown(Layer*, MouseEvent& event) override;
     virtual void on_mouseup(Layer*, MouseEvent& event) override;
     virtual void on_mousemove(Layer*, MouseEvent& event) override;
-    virtual bool on_keydown(GUI::KeyEvent const&) override;
+    virtual bool on_keydown(GUI::KeyEvent&) override;
     virtual void on_second_paint(Layer const*, GUI::PaintEvent&) override;
     virtual GUI::Widget* get_properties_widget() override;
 
diff --git a/Userland/Applications/PixelPaint/Tools/LineTool.cpp b/Userland/Applications/PixelPaint/Tools/LineTool.cpp
index 9a69629556..e520c2c9b1 100644
--- a/Userland/Applications/PixelPaint/Tools/LineTool.cpp
+++ b/Userland/Applications/PixelPaint/Tools/LineTool.cpp
@@ -124,7 +124,7 @@ void LineTool::on_second_paint(Layer const* layer, GUI::PaintEvent& event)
     draw_using(painter, preview_start, preview_end, m_editor->color_for(m_drawing_button), AK::max(m_thickness * m_editor->scale(), 1));
 }
 
-bool LineTool::on_keydown(GUI::KeyEvent const& event)
+bool LineTool::on_keydown(GUI::KeyEvent& event)
 {
     if (event.key() == Key_Escape && m_drawing_button != GUI::MouseButton::None) {
         m_drawing_button = GUI::MouseButton::None;
diff --git a/Userland/Applications/PixelPaint/Tools/LineTool.h b/Userland/Applications/PixelPaint/Tools/LineTool.h
index 3f5ae11467..55d44578ac 100644
--- a/Userland/Applications/PixelPaint/Tools/LineTool.h
+++ b/Userland/Applications/PixelPaint/Tools/LineTool.h
@@ -22,7 +22,7 @@ public:
     virtual void on_mousemove(Layer*, MouseEvent&) override;
     virtual void on_mouseup(Layer*, MouseEvent&) override;
     virtual void on_second_paint(Layer const*, GUI::PaintEvent&) override;
-    virtual bool on_keydown(GUI::KeyEvent const&) override;
+    virtual bool on_keydown(GUI::KeyEvent&) override;
     virtual GUI::Widget* get_properties_widget() override;
     virtual Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap>> cursor() override { return Gfx::StandardCursor::Crosshair; }
 
diff --git a/Userland/Applications/PixelPaint/Tools/MoveTool.cpp b/Userland/Applications/PixelPaint/Tools/MoveTool.cpp
index 4da4f02f61..756492330a 100644
--- a/Userland/Applications/PixelPaint/Tools/MoveTool.cpp
+++ b/Userland/Applications/PixelPaint/Tools/MoveTool.cpp
@@ -106,7 +106,7 @@ void MoveTool::on_mouseup(Layer* layer, MouseEvent& event)
     m_editor->did_complete_action(tool_name());
 }
 
-bool MoveTool::on_keydown(GUI::KeyEvent const& event)
+bool MoveTool::on_keydown(GUI::KeyEvent& event)
 {
     if (event.key() == Key_Shift)
         m_keep_ascept_ratio = true;
diff --git a/Userland/Applications/PixelPaint/Tools/MoveTool.h b/Userland/Applications/PixelPaint/Tools/MoveTool.h
index 0d73ff36c4..b96efe6eb7 100644
--- a/Userland/Applications/PixelPaint/Tools/MoveTool.h
+++ b/Userland/Applications/PixelPaint/Tools/MoveTool.h
@@ -20,7 +20,7 @@ public:
     virtual void on_mousedown(Layer*, MouseEvent&) override;
     virtual void on_mousemove(Layer*, MouseEvent&) override;
     virtual void on_mouseup(Layer*, MouseEvent&) override;
-    virtual bool on_keydown(GUI::KeyEvent const&) override;
+    virtual bool on_keydown(GUI::KeyEvent&) override;
     virtual void on_keyup(GUI::KeyEvent&) override;
     virtual Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap>> cursor() override;
 
diff --git a/Userland/Applications/PixelPaint/Tools/PolygonalSelectTool.cpp b/Userland/Applications/PixelPaint/Tools/PolygonalSelectTool.cpp
index 672b4aa3a4..49352b48d0 100644
--- a/Userland/Applications/PixelPaint/Tools/PolygonalSelectTool.cpp
+++ b/Userland/Applications/PixelPaint/Tools/PolygonalSelectTool.cpp
@@ -150,7 +150,7 @@ void PolygonalSelectTool::on_second_paint(Layer const* layer, GUI::PaintEvent& e
     painter.draw_line(last_line_start, last_line_stop, Color::Black, 1);
 }
 
-bool PolygonalSelectTool::on_keydown(GUI::KeyEvent const& key_event)
+bool PolygonalSelectTool::on_keydown(GUI::KeyEvent& key_event)
 {
     if (key_event.key() == KeyCode::Key_Escape) {
         if (m_selecting) {
diff --git a/Userland/Applications/PixelPaint/Tools/PolygonalSelectTool.h b/Userland/Applications/PixelPaint/Tools/PolygonalSelectTool.h
index 0b0a87c6bc..f7bc6bccb3 100644
--- a/Userland/Applications/PixelPaint/Tools/PolygonalSelectTool.h
+++ b/Userland/Applications/PixelPaint/Tools/PolygonalSelectTool.h
@@ -20,7 +20,7 @@ public:
     virtual void on_doubleclick(Layer*, MouseEvent& event) override;
     virtual void on_mousedown(Layer*, MouseEvent& event) override;
     virtual void on_mousemove(Layer*, MouseEvent& event) override;
-    virtual bool on_keydown(GUI::KeyEvent const&) override;
+    virtual bool on_keydown(GUI::KeyEvent&) override;
     virtual void on_second_paint(Layer const*, GUI::PaintEvent&) override;
     virtual GUI::Widget* get_properties_widget() override;
     virtual Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap>> cursor() override { return Gfx::StandardCursor::Crosshair; }
diff --git a/Userland/Applications/PixelPaint/Tools/RectangleSelectTool.cpp b/Userland/Applications/PixelPaint/Tools/RectangleSelectTool.cpp
index d62ad2d1d2..19232d1839 100644
--- a/Userland/Applications/PixelPaint/Tools/RectangleSelectTool.cpp
+++ b/Userland/Applications/PixelPaint/Tools/RectangleSelectTool.cpp
@@ -103,7 +103,7 @@ void RectangleSelectTool::on_mouseup(Layer*, MouseEvent& event)
     m_editor->did_complete_action(tool_name());
 }
 
-bool RectangleSelectTool::on_keydown(GUI::KeyEvent const& key_event)
+bool RectangleSelectTool::on_keydown(GUI::KeyEvent& key_event)
 {
     if (key_event.key() == KeyCode::Key_Space) {
         m_moving_mode = MovingMode::MovingOrigin;
diff --git a/Userland/Applications/PixelPaint/Tools/RectangleSelectTool.h b/Userland/Applications/PixelPaint/Tools/RectangleSelectTool.h
index 3034ece808..44fb5b18b3 100644
--- a/Userland/Applications/PixelPaint/Tools/RectangleSelectTool.h
+++ b/Userland/Applications/PixelPaint/Tools/RectangleSelectTool.h
@@ -23,7 +23,7 @@ public:
     virtual void on_mousedown(Layer*, MouseEvent& event) override;
     virtual void on_mousemove(Layer*, MouseEvent& event) override;
     virtual void on_mouseup(Layer*, MouseEvent& event) override;
-    virtual bool on_keydown(GUI::KeyEvent const&) override;
+    virtual bool on_keydown(GUI::KeyEvent&) override;
     virtual void on_keyup(GUI::KeyEvent&) override;
     virtual void on_second_paint(Layer const*, GUI::PaintEvent&) override;
     virtual GUI::Widget* get_properties_widget() override;
diff --git a/Userland/Applications/PixelPaint/Tools/RectangleTool.cpp b/Userland/Applications/PixelPaint/Tools/RectangleTool.cpp
index 1327b97e42..6568900961 100644
--- a/Userland/Applications/PixelPaint/Tools/RectangleTool.cpp
+++ b/Userland/Applications/PixelPaint/Tools/RectangleTool.cpp
@@ -130,7 +130,7 @@ void RectangleTool::on_second_paint(Layer const* layer, GUI::PaintEvent& event)
     draw_using(painter, start_position, end_position, AK::max(m_thickness * m_editor->scale(), 1), m_corner_radius * m_editor->scale());
 }
 
-bool RectangleTool::on_keydown(GUI::KeyEvent const& event)
+bool RectangleTool::on_keydown(GUI::KeyEvent& event)
 {
     if (event.key() == Key_Escape && m_drawing_button != GUI::MouseButton::None) {
         m_drawing_button = GUI::MouseButton::None;
diff --git a/Userland/Applications/PixelPaint/Tools/RectangleTool.h b/Userland/Applications/PixelPaint/Tools/RectangleTool.h
index e9c30d988f..756bb0b281 100644
--- a/Userland/Applications/PixelPaint/Tools/RectangleTool.h
+++ b/Userland/Applications/PixelPaint/Tools/RectangleTool.h
@@ -23,7 +23,7 @@ public:
     virtual void on_mousemove(Layer*, MouseEvent&) override;
     virtual void on_mouseup(Layer*, MouseEvent&) override;
     virtual void on_second_paint(Layer const*, GUI::PaintEvent&) override;
-    virtual bool on_keydown(GUI::KeyEvent const&) override;
+    virtual bool on_keydown(GUI::KeyEvent&) override;
     virtual GUI::Widget* get_properties_widget() override;
     virtual Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap>> cursor() override { return Gfx::StandardCursor::Crosshair; }
 
diff --git a/Userland/Applications/PixelPaint/Tools/Tool.cpp b/Userland/Applications/PixelPaint/Tools/Tool.cpp
index ea48b7e07b..a0e3e601f4 100644
--- a/Userland/Applications/PixelPaint/Tools/Tool.cpp
+++ b/Userland/Applications/PixelPaint/Tools/Tool.cpp
@@ -23,7 +23,7 @@ void Tool::set_action(GUI::Action* action)
     m_action = action;
 }
 
-bool Tool::on_keydown(GUI::KeyEvent const& event)
+bool Tool::on_keydown(GUI::KeyEvent& event)
 {
     switch (event.key()) {
     case KeyCode::Key_LeftBracket:
diff --git a/Userland/Applications/PixelPaint/Tools/Tool.h b/Userland/Applications/PixelPaint/Tools/Tool.h
index 4f056ab5a5..7a9430794f 100644
--- a/Userland/Applications/PixelPaint/Tools/Tool.h
+++ b/Userland/Applications/PixelPaint/Tools/Tool.h
@@ -61,7 +61,7 @@ public:
     virtual void on_context_menu(Layer*, GUI::ContextMenuEvent&) { }
     virtual void on_tool_button_contextmenu(GUI::ContextMenuEvent&) { }
     virtual void on_second_paint(Layer const*, GUI::PaintEvent&) { }
-    virtual bool on_keydown(GUI::KeyEvent const&);
+    virtual bool on_keydown(GUI::KeyEvent&);
     virtual void on_keyup(GUI::KeyEvent&) { }
     virtual void on_tool_activation() { }
     virtual void on_tool_deactivation() { }
diff --git a/Userland/Applications/PixelPaint/Tools/WandSelectTool.cpp b/Userland/Applications/PixelPaint/Tools/WandSelectTool.cpp
index cc4d32907d..5677c51030 100644
--- a/Userland/Applications/PixelPaint/Tools/WandSelectTool.cpp
+++ b/Userland/Applications/PixelPaint/Tools/WandSelectTool.cpp
@@ -37,7 +37,7 @@ static void set_flood_selection(Gfx::Bitmap& bitmap, Image& image, Gfx::IntPoint
     image.selection().merge(selection_mask, merge_mode);
 }
 
-bool WandSelectTool::on_keydown(GUI::KeyEvent const& key_event)
+bool WandSelectTool::on_keydown(GUI::KeyEvent& key_event)
 {
     if (key_event.key() == KeyCode::Key_Escape) {
         m_editor->image().selection().clear();
diff --git a/Userland/Applications/PixelPaint/Tools/WandSelectTool.h b/Userland/Applications/PixelPaint/Tools/WandSelectTool.h
index ca66616eda..2a16a4cd26 100644
--- a/Userland/Applications/PixelPaint/Tools/WandSelectTool.h
+++ b/Userland/Applications/PixelPaint/Tools/WandSelectTool.h
@@ -22,7 +22,7 @@ public:
     virtual ~WandSelectTool() = default;
 
     virtual void on_mousedown(Layer*, MouseEvent& event) override;
-    virtual bool on_keydown(GUI::KeyEvent const&) override;
+    virtual bool on_keydown(GUI::KeyEvent&) override;
     virtual GUI::Widget* get_properties_widget() override;
     virtual Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap>> cursor() override { return Gfx::StandardCursor::Crosshair; }