Vimode: handle fold and margin click event

vimode/src/utils.c

@@ -228,3 +228,28 @@ void ensure_current_line_expanded(ScintillaObject *sci)
 	if (!SSM(sci, SCI_GETLINEVISIBLE, line, 0))
 		SSM(sci, SCI_ENSUREVISIBLE, line, 0);
 }
+
+
+gint jump_to_expended_parent(ScintillaObject *sci, gint line)
+{
+	gint fold_parent = line;
+
+	/* go through the parents as long as they are not visible */
+	while (SSM(sci, SCI_GETLINEVISIBLE, fold_parent, 0) == FALSE)
+	{
+		gint prev_parent = SSM(sci, SCI_GETFOLDPARENT, fold_parent, 0);
+
+		if (prev_parent == -1)
+			break;
+		fold_parent = prev_parent;
+	}
+
+	if (fold_parent != line)
+	{
+		/* move the cursor on the visible line before the fold */
+		gint pos = SSM(sci, SCI_POSITIONFROMLINE, fold_parent, 0);
+		SET_POS(sci, pos, TRUE);
+	}
+
+	return fold_parent;
+}

vimode/src/utils.h

@@ -34,4 +34,6 @@ void perform_substitute(ScintillaObject *sci, const gchar *cmd, gint from, gint
 gint get_line_number_rel(ScintillaObject *sci, gint shift);
 void ensure_current_line_expanded(ScintillaObject *sci);
 
+gint jump_to_expended_parent(ScintillaObject *sci, gint line);
+
 #endif

vimode/src/vi.c

@@ -312,6 +312,15 @@ gboolean vi_notify_sci(SCNotification *nt)
 	if (nt->nmhdr.code == SCN_MODIFIED && (nt->modificationType & SC_MOD_BEFOREINSERT && nt->modificationType & SC_PERFORMED_UNDO) && nt->length > 1)
 		undo_update(&ctx, nt->position);
 
+	if (nt->nmhdr.code == SCN_MARGINCLICK)
+	{
+		if (nt->margin == 2)
+		{
+			gint line = GET_CUR_LINE(sci);
+			jump_to_expended_parent(sci, line);
+		}
+	}
+
 	/* This makes sure that when we click behind the end of line in command mode,
 	 * the cursor is not placed BEHIND the last character but ON the last character.
 	 * We want to ignore this when doing selection with mouse as it breaks things. */