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-rw-r--r--src/macfns.c18
1 files changed, 12 insertions, 6 deletions
diff --git a/src/macfns.c b/src/macfns.c
index 9d23f47b5ed..99abc643043 100644
--- a/src/macfns.c
+++ b/src/macfns.c
@@ -3840,16 +3840,22 @@ compute_tip_xy (f, parms, dx, dy, width, height, root_x, root_y)
if (INTEGERP (top))
*root_y = XINT (top);
- else if (*root_y + XINT (dy) - height < 0)
- *root_y -= XINT (dy);
+ else if (*root_y + XINT (dy) <= 0)
+ *root_y = 0; /* Can happen for negative dy */
+ else if (*root_y + XINT (dy) + height <= FRAME_MAC_DISPLAY_INFO (f)->height)
+ /* It fits below the pointer */
+ *root_y += XINT (dy);
+ else if (height + XINT (dy) <= *root_y)
+ /* It fits above the pointer. */
+ *root_y -= height + XINT (dy);
else
- {
- *root_y -= height;
- *root_y += XINT (dy);
- }
+ /* Put it on the top. */
+ *root_y = 0;
if (INTEGERP (left))
*root_x = XINT (left);
+ else if (*root_x + XINT (dx) <= 0)
+ *root_x = 0; /* Can happen for negative dx */
else if (*root_x + XINT (dx) + width <= FRAME_MAC_DISPLAY_INFO (f)->width)
/* It fits to the right of the pointer. */
*root_x += XINT (dx);