Work around two -Werror=implicit-fallthrough=

...that started to crop up with recent GCC 12 trunk (where it expanded
the ENSURE_OR_THROW macro, but apparently didn't take into account that its

>    97 |     if( !(c) ){ \
>       |     ^~

will always be taken in these cases where the c argument is false), and
can easily be avoided by getting rid of those uses of
ENSURE_OR_THROW(false, "...")

(And while at it, move the default case to a more reasonable position in
mtftools.cxx, obsoleting the FALLTHROUGH comment in any case.)

Change-Id: I8189d98b361e6725096d0968f3e0e604fb84e591
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/126452
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

cppcanvas/source/mtfrenderer/mtftools.cxx

@@ -61,10 +61,6 @@ namespace cppcanvas::tools
                     return ::Size( 0,
                                    aMetric.GetInternalLeading() + aMetric.GetAscent() );
 
-                default:
-                    ENSURE_OR_THROW( false,
-                                      "tools::getBaselineOffset(): Unexpected TextAlign value" );
-                    // FALLTHROUGH intended (to calm compiler warning - case won't happen)
                 case ALIGN_BASELINE:
                     return ::Size( 0, 0 );
 
@@ -72,6 +68,9 @@ namespace cppcanvas::tools
                     return ::Size( 0,
                                    -aMetric.GetDescent() );
 
+                default:
+                    throw css::uno::RuntimeException(
+                                      "tools::getBaselineOffset(): Unexpected TextAlign value" );
             }
         }
 

slideshow/source/engine/animationnodes/animationtransformnode.cxx

@@ -45,8 +45,8 @@ AnimationActivitySharedPtr AnimationTransformNode::createActivity() const
     switch( nTransformType )
     {
     default:
-        ENSURE_OR_THROW(
-            false, "AnimationTransformNode::createTransformActivity(): "
+        throw css::uno::RuntimeException(
+            "AnimationTransformNode::createTransformActivity(): "
             "Unknown transform type" );
 
     case animations::AnimationTransformType::TRANSLATE: