diff --git a/src/macos.m b/src/macos.m

index 6bec3c12..d588fa4a 100644

--- a/src/macos.m

+++ b/src/macos.m

@@ -60,6 +60,7 @@ static NSString *currentSystemAppearance_(void) {

}



iBool shouldDefaultToMetalRenderer_MacOS(void) {

+ /* TODO: Test if SDL 2.0.16 works better (no stutters with Metal?). */

 return iFalse; /*

 const iInt2 ver = macVer_();

 return ver.x > 10 || ver.y > 13;*/

diff --git a/src/ui/labelwidget.c b/src/ui/labelwidget.c

index d6cc31cb..edc36a49 100644

--- a/src/ui/labelwidget.c

+++ b/src/ui/labelwidget.c

@@ -300,14 +300,15 @@ static void draw_LabelWidget_(const iLabelWidget *d) {

             bottomLeft_Rect(frameRect),

             topLeft_Rect(frameRect),

             topRight_Rect(frameRect),

-#if SDL_VERSION_ATLEAST(2, 0, 16) && defined (iPlatformApple)

- /* A very curious regression in SDL 2.0.16 on macOS. */

- addX_I2(bottomRight_Rect(frameRect), -1),

-#else

             bottomRight_Rect(frameRect),

-#endif

             bottomLeft_Rect(frameRect)

         };

+#if SDL_VERSION_ATLEAST(2, 0, 16)

+ if (isOpenGLRenderer_Window()) {

+ /* A very curious regression in SDL 2.0.16. */

+ points[3].x--; 

+ }

+#endif

         drawLines_Paint(&p, points + 2, 3, frame2);

         drawLines_Paint(

             &p, points, !isHover && flags & d->flags.noTopFrame ? 2 : 3, frame);

diff --git a/src/ui/paint.c b/src/ui/paint.c

index 869238d5..79adb7d1 100644

--- a/src/ui/paint.c

+++ b/src/ui/paint.c

@@ -89,17 +89,19 @@ void drawRect_Paint(const iPaint *d, iRect rect, int color) {

 /* Keep the right/bottom edge visible in the window. */

 if (br.x == d->dst->size.x) br.x--;

 if (br.y == d->dst->size.y) br.y--;

- const SDL_Point edges[] = {

+ SDL_Point edges[] = {

     { left_Rect(rect),  top_Rect(rect) },

     { br.x,             top_Rect(rect) },

     { br.x,             br.y },

-#if SDL_VERSION_ATLEAST(2, 0, 16) && defined (iPlatformApple)

- { left_Rect(rect), br.y - 1 }, /* regression in SDL 2.0.16? */

-#else

     { left_Rect(rect),  br.y },

-#endif

     { left_Rect(rect),  top_Rect(rect) }

 };

+#if SDL_VERSION_ATLEAST(2, 0, 16)

+ if (isOpenGLRenderer_Window()) {

+ /* A very curious regression in SDL 2.0.16. */

+ edges[3].y--;

+ }

+#endif

 setColor_Paint_(d, color);

 SDL_RenderDrawLines(renderer_Paint_(d), edges, iElemCount(edges));

}

diff --git a/src/ui/window.c b/src/ui/window.c

index 6b8abb4d..86d22b1c 100644

--- a/src/ui/window.c

+++ b/src/ui/window.c

@@ -65,6 +65,8 @@ static float initialUiScale_ = 1.0f;

static float initialUiScale_ = 1.1f;

#endif



+static iBool isOpenGLRenderer_;

+

iDefineTypeConstructionArgs(Window, (iRect rect), rect)



/* TODO: Define menus per platform. */

@@ -446,6 +448,7 @@ void init_Window(iWindow *d, iRect rect) {

 /* Some info. */ {

     SDL_RendererInfo info;

     SDL_GetRendererInfo(d->render, &info);

+ isOpenGLRenderer_ = !iCmpStr(info.name, "opengl");

     printf("[window] renderer: %s%s\n", info.name,

            info.flags & SDL_RENDERER_ACCELERATED ? " (accelerated)" : "");

#if !defined (NDEBUG)

@@ -1187,6 +1190,10 @@ iWindow *get_Window(void) {

 return theWindow_;

}



+iBool isOpenGLRenderer_Window(void) {

+ return isOpenGLRenderer_;

+}

+

void setKeyboardHeight_Window(iWindow *d, int height) {

 if (d->keyboardHeight != height) {

     d->keyboardHeight = height;

diff --git a/src/ui/window.h b/src/ui/window.h

index bb98dbe9..63f7e5f2 100644

--- a/src/ui/window.h

+++ b/src/ui/window.h

@@ -137,6 +137,8 @@ iRoot * findRoot_Window (const iWindow *, const iWidget *widget);

iRoot * otherRoot_Window (const iWindow *, iRoot *root);

iWindow * get_Window (void);



+iBool isOpenGLRenderer_Window (void);

+

#if defined (LAGRANGE_ENABLE_CUSTOM_FRAME)

SDL_HitTestResult hitTest_Window(const iWindow *d, iInt2 pos);

#endif