[gnome-builder/wip/chergert/bug1: 27/29] debugger: only clear debugger when new instance is set

[Christian Hergert <chergert src gnome org>]

commit 8b5090b32e9efa8b427620db33314415511dc8d6
Author: Christian Hergert <chergert redhat com>
Date:   Mon Aug 28 12:25:17 2017 -0700

    debugger: only clear debugger when new instance is set
    
    If we are clearing the old debugger because it ended, keep the log alive
    for the user to potentially glean some insight.

 libide/debugger/ide-debugger-perspective.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/libide/debugger/ide-debugger-perspective.c b/libide/debugger/ide-debugger-perspective.c
index 9223b8f..e8ae7fe 100644
--- a/libide/debugger/ide-debugger-perspective.c
+++ b/libide/debugger/ide-debugger-perspective.c
@@ -136,8 +136,14 @@ ide_debugger_perspective_set_debugger (IdeDebuggerPerspective *self,
 
   if (g_set_object (&self->debugger, debugger))
     {
+      /* Clear the log if this is a new debugger instance,
+       * otherwise allow the user to read the backlog in case
+       * there was something useful for debugging.
+       */
+      if (debugger != NULL)
+        gtk_text_buffer_set_text (self->log_buffer, "", 0);
+
       dzl_signal_group_set_target (self->debugger_signals, debugger);
-      gtk_text_buffer_set_text (self->log_buffer, "", 0);
       g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_DEBUGGER]);
     }