[gimp] devel-docs: update debugging-tips.txt regarding --stack-trace-mode...

[Jehan Pagès <jehanp src gnome org>]

commit 6bcb30e1eeb556a9256729f9b9f219cf6c400d8e
Author: Jehan <jehan girinstud io>
Date:   Wed Apr 4 04:13:28 2018 +0200

    devel-docs: update debugging-tips.txt regarding --stack-trace-mode...
    
    ... for plug-in debugging as well.

 devel-docs/debugging-tips.txt |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/devel-docs/debugging-tips.txt b/devel-docs/debugging-tips.txt
index 6384d1f..8a4d22d 100644
--- a/devel-docs/debugging-tips.txt
+++ b/devel-docs/debugging-tips.txt
@@ -81,3 +81,6 @@ particular the environment variable GIMP_ICONS_LIKE_A_BOSS.
 
 See file `devel-docs/debug-plug-ins.txt` for usage of environment
 variable GIMP_PLUGIN_DEBUG.
+
+The CLI option --stack-trace-mode also applies to plug-ins, in order to
+output a back trace on terminal.