Change concat to << since the buffer no longer supports the former (

#652)

Co-authored-by: Uwe Kubosch <uwe@datek.no>

Dangerfile

@@ -19,8 +19,8 @@ has_changelog_changes = git.modified_files.include?("CHANGELOG.md")
 # You've made changes to lib, but didn't write any tests?
 # ------------------------------------------------------------------------------
 if has_lib_changes && !has_test_changes
-  warn("There are code changes, but no corresponding tests. "\
-       "Please include tests if this PR introduces any modifications in "\
+  warn("There are code changes, but no corresponding tests. " \
+       "Please include tests if this PR introduces any modifications in " \
        "#{project_name}'s behavior.",
        sticky: false)
 end
@@ -36,8 +36,8 @@ if !has_changelog_changes && has_lib_changes
   * [##{pr_number}](#{pr_url}): #{github.pr_title} - [@#{github.pr_author}](https://github.com/#{github.pr_author}).
   ```
   MARKDOWN
-  warn("Please update CHANGELOG.md with a description of your changes. "\
-       "If this PR is not a user-facing change (e.g. just refactoring), "\
+  warn("Please update CHANGELOG.md with a description of your changes. " \
+       "If this PR is not a user-facing change (e.g. just refactoring), " \
        "you can disregard this.", sticky: false)
 end
 

bootstrap_form.gemspec

@@ -9,9 +9,9 @@ Gem::Specification.new do |s|
   s.authors     = ["Stephen Potenza", "Carlos Lopes"]
   s.email       = ["potenza@gmail.com", "carlos.el.lopes@gmail.com"]
   s.homepage    = "https://github.com/bootstrap-ruby/bootstrap_form"
-  s.summary     = "Rails form builder that makes it easy to style forms using "\
+  s.summary     = "Rails form builder that makes it easy to style forms using " \
                   "Bootstrap 5"
-  s.description = "bootstrap_form is a rails form builder that makes it super "\
+  s.description = "bootstrap_form is a rails form builder that makes it super " \
                   "easy to create beautiful-looking forms using Bootstrap 5"
   s.license     = "MIT"
   s.metadata    = { "rubygems_mfa_required" => "true" }

lib/bootstrap_form/form_group.rb

@@ -34,7 +34,7 @@ def form_group_content_tag(name, field_name, without_field_name, options, html_o
 
     def form_group_content(label, help_text, options, &block)
       if group_layout_horizontal?(options[:layout])
-        concat(label).concat(tag.div(capture(&block) + help_text, class: form_group_control_class(options)))
+        concat(label) << tag.div(capture(&block) + help_text, class: form_group_control_class(options))
       else
         # Floating labels need to be rendered after the field
         concat(label) unless options[:floating]