patch 8.2.0320: no Haiku support
Problem: No Haiku support.
Solution: Add support for Haiku. (Emir Sari, closes #5605)
diff --git a/src/mouse.c b/src/mouse.c
index 5b468d6..5abb942 100644
--- a/src/mouse.c
+++ b/src/mouse.c
@@ -538,7 +538,7 @@
// menu on the button down event.
return FALSE;
# endif
-# if defined(FEAT_GUI_ATHENA) || defined(FEAT_GUI_MSWIN)
+# if defined(FEAT_GUI_ATHENA) || defined(FEAT_GUI_MSWIN) || defined(FEAT_GUI_HAIKU)
if (is_click || is_drag)
// Ignore right button down and drag mouse events. Windows
// only shows the popup menu on the button up event.