diff --git a/eeshow/gui/aoi.c b/eeshow/gui/aoi.c
index 45e3012..1ec5818 100644
--- a/eeshow/gui/aoi.c
+++ b/eeshow/gui/aoi.c
@@ -72,13 +72,16 @@ bool aoi_hover(struct aoi *const *aois, int x, int y)
 	if (hovering) {
 		if (in_aoi(hovering, x, y))
 			return 1;
-		hovering->hover(hovering->user, 0);
+		aoi = hovering;
+		aoi->hover(aoi->user, 0,
+		    x < aoi->x ? -1 : x >= aoi->x + aoi->w ? 1 : 0,
+		    y < aoi->y ? -1 : y >= aoi->y + aoi->h ? 1 : 0);
 		hovering = NULL;
 	}
 
 	for (aoi = *aois; aoi; aoi = aoi->next)
 		if (aoi->hover && in_aoi(aoi, x, y) &&
-		    aoi->hover(aoi->user, 1)) {
+		    aoi->hover(aoi->user, 1, 0, 0)) {
 			hovering = aoi;
 			return 1;
 		}
@@ -130,7 +133,7 @@ void aoi_remove(struct aoi **aois, const struct aoi *aoi)
 {
 	assert(aoi);
 	if (hovering == aoi) {
-		aoi->hover(aoi->user, 0);
+		aoi->hover(aoi->user, 0, 0, 0);
 		hovering = NULL;
 	}
 	while (*aois && *aois != aoi)
@@ -144,6 +147,6 @@ void aoi_remove(struct aoi **aois, const struct aoi *aoi)
 void aoi_dehover(void)
 {
 	if (hovering)
-		hovering->hover(hovering->user, 0);
+		hovering->hover(hovering->user, 0, 0, 0);
 	hovering = NULL;
 }
diff --git a/eeshow/gui/aoi.h b/eeshow/gui/aoi.h
index 6ac9889..fb3a833 100644
--- a/eeshow/gui/aoi.h
+++ b/eeshow/gui/aoi.h
@@ -20,7 +20,7 @@ struct aoi {
 	int x, y, w, h;		/* activation box, eeschema coordinates */
 				/* points to hovered aoi, or NULL */
 
-	bool (*hover)(void *user, bool on);
+	bool (*hover)(void *user, bool on, int dx, int dy);
 	void (*click)(void *user);
 	void *user;
 
diff --git a/eeshow/gui/glabel.c b/eeshow/gui/glabel.c
index 83936da..8d7586b 100644
--- a/eeshow/gui/glabel.c
+++ b/eeshow/gui/glabel.c
@@ -132,7 +132,7 @@ static void add_dest_overlay(struct gui_ctx *ctx, const char *label,
 }
 
 
-static bool pop_hover(void *user, bool on)
+static bool pop_hover(void *user, bool on, int dx, int dy)
 {
 	struct gui_ctx *ctx = user;
 
@@ -184,7 +184,7 @@ static void add_dest_frame(struct gui_ctx *ctx)
 }
 
 
-static bool hover_glabel(void *user, bool on)
+static bool hover_glabel(void *user, bool on, int dx, int dy)
 {
 	struct glabel_aoi_ctx *aoi_ctx = user;
 	struct gui_ctx *ctx = aoi_ctx->sheet->ctx;
diff --git a/eeshow/gui/history.c b/eeshow/gui/history.c
index e17b8c3..4deef17 100644
--- a/eeshow/gui/history.c
+++ b/eeshow/gui/history.c
@@ -82,7 +82,7 @@ static void set_history_style(struct gui_hist *h, bool current)
 }
 
 
-static bool hover_history(void *user, bool on)
+static bool hover_history(void *user, bool on, int dx, int dy)
 {
 	struct gui_hist *h = user;
 	struct gui_ctx *ctx = h->ctx;
@@ -274,7 +274,7 @@ void show_history(struct gui_ctx *ctx, enum selecting sel)
 		h = skip_history(ctx, h);
 		h->over = overlay_add(&ctx->hist_overlays, &ctx->aois,
 		    hover_history, click_history, h);
-		hover_history(h, 0);
+		hover_history(h, 0, 0, 0);
 		set_history_style(h, 0);
 	}
 	redraw(ctx);
diff --git a/eeshow/gui/over.c b/eeshow/gui/over.c
index 9bdec04..aede7c5 100644
--- a/eeshow/gui/over.c
+++ b/eeshow/gui/over.c
@@ -45,7 +45,7 @@ struct overlay {
 	struct overlay_style style;
 
 	struct aoi **aois;
-	bool (*hover)(void *user, bool on);
+	bool (*hover)(void *user, bool on, int dx, int dy);
 	void (*click)(void *user);
 	void *user;
 
@@ -420,7 +420,8 @@ void overlay_size_all(const struct overlay *overlays,
 
 
 struct overlay *overlay_add(struct overlay **overlays, struct aoi **aois,
-    bool (*hover)(void *user, bool on), void (*click)(void *user), void *user)
+    bool (*hover)(void *user, bool on, int dx, int dy),
+    void (*click)(void *user), void *user)
 {
 	struct overlay *over, *prev;
 	struct overlay **anchor;
diff --git a/eeshow/gui/over.h b/eeshow/gui/over.h
index e77793c..f80e1f8 100644
--- a/eeshow/gui/over.h
+++ b/eeshow/gui/over.h
@@ -54,7 +54,8 @@ void overlay_size_all(const struct overlay *overlays,
     PangoContext *pango_context, bool dx, bool dy, int *w, int *h);
 
 struct overlay *overlay_add(struct overlay **overlays, struct aoi **aois,
-    bool (*hover)(void *user, bool on), void (*click)(void *user), void *user);
+    bool (*hover)(void *user, bool on, int dx, int dy),
+    void (*click)(void *user), void *user);
 
 void overlay_text_raw(struct overlay *over, const char *s);
 void overlay_text(struct overlay *over, const char *fmt, ...);
diff --git a/eeshow/gui/sheet.c b/eeshow/gui/sheet.c
index 841363e..a3687ac 100644
--- a/eeshow/gui/sheet.c
+++ b/eeshow/gui/sheet.c
@@ -123,7 +123,7 @@ static void zoom_to_extents(struct gui_ctx *ctx)
 /* ----- Revision selection overlays --------------------------------------- */
 
 
-static bool show_history_details(void *user, bool on)
+static bool show_history_details(void *user, bool on, int dx, int dy)
 {
 	struct gui_hist *h = user;
 	struct gui_ctx *ctx = h->ctx;
@@ -219,7 +219,7 @@ static void revision_overlays_diff(struct gui_ctx *ctx)
 	if (ctx->diff_mode == diff_new)
 		style.frame = RGBA(0, 0, 0, 1);
 	overlay_style(new->over, &style);
-	show_history_details(new, 0);
+	show_history_details(new, 0, 0, 0);
 
 	add_delta(ctx);
 
@@ -229,7 +229,7 @@ static void revision_overlays_diff(struct gui_ctx *ctx)
 	if (ctx->diff_mode == diff_old)
 		style.frame = RGBA(0, 0, 0, 1);
 	overlay_style(old->over, &style);
-	show_history_details(old, 0);
+	show_history_details(old, 0, 0, 0);
 }
 
 
@@ -244,7 +244,7 @@ void do_revision_overlays(struct gui_ctx *ctx)
 		    &ctx->aois, show_history_details, show_history_cb,
 		    ctx->new_hist);
 		overlay_style(ctx->new_hist->over, &overlay_style_default);
-		show_history_details(ctx->new_hist, 0);
+		show_history_details(ctx->new_hist, 0, 0, 0);
 
 		add_delta(ctx);
 	}
@@ -263,7 +263,7 @@ static void close_subsheet(void *user)
 }
 
 
-static bool hover_sheet(void *user, bool on)
+static bool hover_sheet(void *user, bool on, int dx, int dy)
 {
 	struct gui_sheet *sheet = user;
 	struct gui_ctx *ctx = sheet->ctx;
@@ -314,7 +314,7 @@ static void sheet_selector_recurse(struct gui_ctx *ctx, struct gui_sheet *sheet)
 		sheet_selector_recurse(ctx, parent);
 	sheet->over = overlay_add(&ctx->sheet_overlays, &ctx->aois,
 	    hover_sheet, close_subsheet, sheet);
-	hover_sheet(sheet, 0);
+	hover_sheet(sheet, 0, 0, 0);
 }