[gimp] app: fix CRITICAL when initializing the perspective-clone tool

[Ell <ell src gnome org>]

commit 07d2d5af5a0fb11ba544fddedba0481e2a91651f
Author: Ell <ell_se yahoo com>
Date:   Thu Jan 31 09:06:22 2019 -0500

    app: fix CRITICAL when initializing the perspective-clone tool
    
    When initializaing the perspective-clone tool in paint mode, the
    GimpDrawTool may already be active, causing the call to
    gimp_draw_tool_start() to fail with a CRITICAL.  Stop the draw tool
    first, if active, to avoid that.

 app/tools/gimpperspectiveclonetool.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/app/tools/gimpperspectiveclonetool.c b/app/tools/gimpperspectiveclonetool.c
index f05f010ec2..308e2be643 100644
--- a/app/tools/gimpperspectiveclonetool.c
+++ b/app/tools/gimpperspectiveclonetool.c
@@ -260,6 +260,9 @@ gimp_perspective_clone_tool_initialize (GimpTool     *tool,
                         clone_tool);
 
       /*  start drawing the bounding box and handles...  */
+      if (gimp_draw_tool_is_active (GIMP_DRAW_TOOL (tool)))
+        gimp_draw_tool_stop (GIMP_DRAW_TOOL (tool));
+
       gimp_draw_tool_start (GIMP_DRAW_TOOL (tool), display);
 
       /*  Save the current transformation info  */