vendor: Update vendored sources to igraph/igraph@1d6ef7c

refactor: minor readability cleanup in igraph_decompose()

Author: krlmlr

src/vendor/cigraph/src/connectivity/components.c

@@ -640,13 +640,18 @@ static igraph_error_t igraph_i_decompose_strong(const igraph_t *graph,
 igraph_error_t igraph_decompose(const igraph_t *graph, igraph_graph_list_t *components,
                      igraph_connectedness_t mode,
                      igraph_integer_t maxcompno, igraph_integer_t minelements) {
-    if (mode == IGRAPH_WEAK || !igraph_is_directed(graph)) {
+    if (!igraph_is_directed(graph)) {
+        mode = IGRAPH_WEAK;
+    }
+
+    switch (mode) {
+    case IGRAPH_WEAK:
         return igraph_i_decompose_weak(graph, components, maxcompno, minelements);
-    } else if (mode == IGRAPH_STRONG) {
+    case IGRAPH_STRONG:
         return igraph_i_decompose_strong(graph, components, maxcompno, minelements);
+    default:
+        IGRAPH_ERROR("Invalid connectedness mode.", IGRAPH_EINVAL);
     }
-
-    IGRAPH_ERROR("Cannot decompose graph", IGRAPH_EINVAL);
 }
 
 static igraph_error_t igraph_i_decompose_weak(const igraph_t *graph,

src/vendor/igraph_version.h

@@ -28,11 +28,11 @@
 
 __BEGIN_DECLS
 
-#define IGRAPH_VERSION "0.10.13-133-g0878f577d"
+#define IGRAPH_VERSION "0.10.13-134-g1d6ef7c41"
 #define IGRAPH_VERSION_MAJOR 0
 #define IGRAPH_VERSION_MINOR 10
 #define IGRAPH_VERSION_PATCH 13
-#define IGRAPH_VERSION_PRERELEASE "133-g0878f577d"
+#define IGRAPH_VERSION_PRERELEASE "134-g1d6ef7c41"
 
 IGRAPH_EXPORT void igraph_version(const char **version_string,
                                   int *major,