X-Git-Url: https://git.lyx.org/gitweb/?a=blobdiff_plain;f=src%2FBufferView_pimpl.C;h=2f4848f6a26f47929fb957b5495823bdbed27ce5;hb=e0660589c44ac5f3b2920be0db260fff58290b53;hp=36b457694f4eb61e7f5646d2e817fb40cee6e764;hpb=2ed6872ad5c59e43f92aedad9df9e669468938c4;p=lyx.git

diff --git a/src/BufferView_pimpl.C b/src/BufferView_pimpl.C
index 36b457694f..2f4848f6a2 100644
--- a/src/BufferView_pimpl.C
+++ b/src/BufferView_pimpl.C
@@ -384,19 +384,26 @@ void BufferView::Pimpl::scrollDocView(int value)
 }
 
 
-int BufferView::Pimpl::scroll(long time)
+void BufferView::Pimpl::scroll(int lines)
 {
-	if (!buffer_)
-		return 0;
+	if (!buffer_) {
+		return;
+	}
 
 	LyXText const * t = bv_->text;
+	int const line_height = t->defaultHeight();
 
-	double const diff = t->defaultHeight()
-		+ double(time) * double(time) * 0.125;
+	// The new absolute coordinate
+	int new_first_y = t->first_y + lines * line_height;
 
-	scrollDocView(int(diff));
+	// Restrict to a valid value
+	new_first_y = std::min(t->height - 4 * line_height, new_first_y);
+	new_first_y = std::max(0, new_first_y);
+
+	scrollDocView(new_first_y);
+
+	// Update the scrollbar.
 	workarea().setScrollbarParams(t->height, t->first_y, t->defaultHeight());
-	return 0;
 }