[gimp] app: in GimpFlipTool, stop drawing before initializing tool

[N/A <ell src gnome org>]

commit 589e27bf0cde4e0a56ec4924dbf306feeca3a8f7
Author: Ell <ell_se yahoo com>
Date:   Wed Sep 20 07:41:46 2017 -0400

    app: in GimpFlipTool, stop drawing before initializing tool
    
    ... so that it doesn't clash with GimpTransformTool's logic, causing
    CRITICALs.

 app/tools/gimpfliptool.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)
---
diff --git a/app/tools/gimpfliptool.c b/app/tools/gimpfliptool.c
index fae1889..3df877f 100644
--- a/app/tools/gimpfliptool.c
+++ b/app/tools/gimpfliptool.c
@@ -56,6 +56,9 @@
 
 static GimpDisplay         * gimp_flip_tool_has_image     (GimpTool           *tool,
                                                            GimpImage          *image);
+static gboolean              gimp_flip_tool_initialize    (GimpTool           *tool,
+                                                           GimpDisplay        *display,
+                                                           GError            **error);
 static void                  gimp_flip_tool_modifier_key  (GimpTool           *tool,
                                                            GdkModifierType     key,
                                                            gboolean            press,
@@ -117,6 +120,7 @@ gimp_flip_tool_class_init (GimpFlipToolClass *klass)
   GimpTransformToolClass *trans_class     = GIMP_TRANSFORM_TOOL_CLASS (klass);
 
   tool_class->has_image      = gimp_flip_tool_has_image;
+  tool_class->initialize     = gimp_flip_tool_initialize;
   tool_class->modifier_key   = gimp_flip_tool_modifier_key;
   tool_class->oper_update    = gimp_flip_tool_oper_update;
   tool_class->cursor_update  = gimp_flip_tool_cursor_update;
@@ -155,6 +159,20 @@ gimp_flip_tool_has_image (GimpTool  *tool,
   return NULL;
 }
 
+static gboolean
+gimp_flip_tool_initialize (GimpTool     *tool,
+                           GimpDisplay  *display,
+                           GError      **error)
+{
+  GimpDrawTool *draw_tool = GIMP_DRAW_TOOL (tool);
+
+  /* let GimpTransformTool take control over the draw tool while it's active */
+  if (gimp_draw_tool_is_active (draw_tool))
+    gimp_draw_tool_stop (draw_tool);
+
+  return GIMP_TOOL_CLASS (parent_class)->initialize (tool, display, error);
+}
+
 static void
 gimp_flip_tool_modifier_key (GimpTool        *tool,
                              GdkModifierType  key,