do_select: do not propagate errors on incremental search

src/main.cc

@@ -137,6 +137,8 @@ void do_search(Context& context)
     SelectionList selections = context.editor().selections();
     context.input_handler().prompt("/", complete_nothing,
         [selections](const String& str, PromptEvent event, Context& context) {
+            try
+            {
                 context.editor().select(selections);
 
                 if (str.empty() or event == PromptEvent::Abort)
@@ -151,7 +153,18 @@ void do_search(Context& context)
                         RegisterManager::instance()['/'] = ex;
                     context.push_jump();
                 }
+
                 context.editor().select(std::bind(select_next_match, _1, ex), mode);
+            }
+            catch (runtime_error&)
+            {
+                context.editor().select(selections);
+                // only validation should propagate errors,
+                // incremental search should not.
+                if (event == PromptEvent::Validate)
+                    throw;
+            }
+
         }, context);
 }