[LyX/master] Add default TransformID enum value

[Yuriy Skalko]

commit fe0ea7bff7d89a4edaec83a272769281d39695d2
Author: Yuriy Skalko <yuriy.skalko at gmail.com>
Date:   Tue Nov 24 20:46:49 2020 +0200

    Add default TransformID enum value
---
 src/insets/ExternalTemplate.cpp |    2 +-
 src/insets/ExternalTransforms.h |    1 +
 2 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/src/insets/ExternalTemplate.cpp b/src/insets/ExternalTemplate.cpp
index 02f4e87..e7eca8b 100644
--- a/src/insets/ExternalTemplate.cpp
+++ b/src/insets/ExternalTemplate.cpp
@@ -36,7 +36,7 @@ typedef Translator<TransformID, string> TransformIDTranslator;
 
 static TransformIDTranslator const initIDTranslator()
 {
-	TransformIDTranslator translator(TransformID(-1), "");
+	TransformIDTranslator translator(None, "");
 	translator.addPair(Rotate, "Rotate");
 	translator.addPair(Resize, "Resize");
 	translator.addPair(Clip,   "Clip");
diff --git a/src/insets/ExternalTransforms.h b/src/insets/ExternalTransforms.h
index 62e3342..2311ac2 100644
--- a/src/insets/ExternalTransforms.h
+++ b/src/insets/ExternalTransforms.h
@@ -307,6 +307,7 @@ std::string const sanitizeDocBookOption(std::string const & input);
 
 
 enum TransformID {
+	None = -1,
 	Rotate,
 	Resize,
 	Clip,