[gnome-shell] st/entry: Fix leak when copying or cutting text using shortcuts

[Florian Müllner <fmuellner src gnome org>]

commit fdfcacf1db70df6dfe214838c65f5f6e329d27ee
Author: Sebastian Keller <skeller gnome org>
Date:   Mon Jun 8 00:42:00 2020 +0200

    st/entry: Fix leak when copying or cutting text using shortcuts
    
    clutter_text_get_selection() creates a copy of the selected text which
    gets passed to st_clipboard_set_text() which creates its own copy. The
    copy returned by clutter_text_get_selection() however never got free'd.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1306

 src/st/st-entry.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/src/st/st-entry.c b/src/st/st-entry.c
index c946ca0f9d..10dfe1dd16 100644
--- a/src/st/st-entry.c
+++ b/src/st/st-entry.c
@@ -678,6 +678,8 @@ st_entry_key_press_event (ClutterActor    *actor,
                                ST_CLIPBOARD_TYPE_CLIPBOARD,
                                text);
 
+      g_free (text);
+
       return TRUE;
     }
 
@@ -704,6 +706,8 @@ st_entry_key_press_event (ClutterActor    *actor,
           clutter_text_delete_selection ((ClutterText *) priv->entry);
         }
 
+      g_free (text);
+
       return TRUE;
     }