[gimp] devel-docs: quick command to get the right flatpak runtime version.

[Jehan <jehanp src gnome org>]

commit f3ee39c3c47c1d0f975d818aa53e60ae867fbaad
Author: Jehan <jehan girinstud io>
Date:   Sun Mar 28 17:18:52 2021 +0200

    devel-docs: quick command to get the right flatpak runtime version.
    
    For debugging the flatpak, we often ask people to install the SDK and
    debug data. Yet there might be several branches of the GNOME SDK
    installed at once, hence flatpak will ask which version to install.
    
    This quick command can be copy-pasted as it's a way to detect which
    runtime is being used by your flatpak-ed GIMP.

 devel-docs/debugging-tips.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/devel-docs/debugging-tips.txt b/devel-docs/debugging-tips.txt
index 80c8c74780..a6a86d2f18 100644
--- a/devel-docs/debugging-tips.txt
+++ b/devel-docs/debugging-tips.txt
@@ -160,7 +160,8 @@ Here is how you can find the proper code line in the Flatpak (provided
 you use the right flatpak commit):
 
 ```
-$ flatpak install flathub org.gimp.GIMP.Debug org.gnome.Sdk.Debug
+$ RUNTIME_VERSION=$(flatpak run org.gimp.GIMP//stable -v |grep runtime=runtime/org.gnome.Platform/ |sed 
's$runtime=runtime/org.gnome.Platform/$$')
+$ flatpak install flathub org.gimp.GIMP.Debug org.gnome.Sdk/$RUNTIME_VERSION 
org.gnome.Sdk.Debug/$RUNTIME_VERSION
 $ flatpak run --devel --command=bash org.gimp.GIMP
 (flatpak) $ gdb /app/bin/gimp-2.10
 (gdb) info line *(file_open_image+0x4e8)