[gnome-builder] threading: allow repeated calls to supervisor

[Christian Hergert <chergert src gnome org>]

commit 36f24b8264a867698243b2756eee2d038ebfdfbf
Author: Christian Hergert <chergert redhat com>
Date:   Wed Mar 3 17:07:50 2021 -0800

    threading: allow repeated calls to supervisor

 src/libide/threading/ide-subprocess-supervisor.c | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/src/libide/threading/ide-subprocess-supervisor.c 
b/src/libide/threading/ide-subprocess-supervisor.c
index 820ace934..7b8885612 100644
--- a/src/libide/threading/ide-subprocess-supervisor.c
+++ b/src/libide/threading/ide-subprocess-supervisor.c
@@ -222,6 +222,9 @@ ide_subprocess_supervisor_start (IdeSubprocessSupervisor *self)
 
   g_return_if_fail (IDE_IS_SUBPROCESS_SUPERVISOR (self));
 
+  if (priv->supervising)
+    return;
+
   if (priv->launcher == NULL)
     {
       g_warning ("Cannot supervise process, no launcher has been set");
@@ -278,6 +281,9 @@ ide_subprocess_supervisor_stop (IdeSubprocessSupervisor *self)
 
   g_return_if_fail (IDE_IS_SUBPROCESS_SUPERVISOR (self));
 
+  if (!priv->supervising)
+    return;
+
   if (priv->launcher == NULL)
     {
       g_warning ("Cannot unsupervise process, no launcher has been set");