Fix providing vector-like options using the equals sign (#648)

CHANGELOG.md

@@ -20,6 +20,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
   and translation with options --tsv and --tsv-fields n.
 
 ### Fixed
+- Providing a single value to vector-like options using the equals sign, e.g. --models=model.npz
 - CMake-based compilation on Windows
 - Fix minor issues with compilation on MacOS
 - Fix warnings in Windows MSVC builds using CMake

src/3rd_party/CLI/App.hpp

@@ -1595,7 +1595,8 @@ class App {
         if(num < 0) {
             // RG: We need to keep track if the vector option is empty and handle this separately as
             // otherwise the parser will mark the command-line option as not set
-            bool emptyVectorArgs = true;
+            // RG: An option value after '=' was already collected
+            bool emptyVectorArgs = (collected <= 0);
             while(!args.empty() && _recognize(args.back()) == detail::Classifer::NONE) {
                 if(collected >= -num) {
                     // We could break here for allow extras, but we don't