Fix CSS grid on a new Project/Group Milestone

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

app/views/groups/milestones/_form.html.haml

 = form_for [@group, @milestone], html: { class: 'milestone-form common-note-form js-quick-submit js-requires-input' } do |f|
+  = form_errors(@milestone)
   .row
-    = form_errors(@milestone)
-
     .col-md-6
       .form-group.row
-        = f.label :title, "Title", class: "col-form-label col-sm-2"
+        .col-form-label.col-sm-2
+          = f.label :title, "Title"
         .col-sm-10
           = f.text_field :title, maxlength: 255, class: "form-control", required: true, autofocus: true
       .form-group.row.milestone-description
-        = f.label :description, "Description", class: "col-form-label col-sm-2"
+        .col-form-label.col-sm-2
+          = f.label :description, "Description"
         .col-sm-10
           = render layout: 'projects/md_preview', locals: { url: group_preview_markdown_path } do
             = render 'projects/zen', f: f, attr: :description, classes: 'note-textarea', placeholder: 'Write milestone description...', supports_autocomplete: false
-            .clearfix
-            .error-alert
-
+          .clearfix
+          .error-alert
     = render "shared/milestones/form_dates", f: f
 
   .form-actions

app/views/projects/milestones/_form.html.haml

@@ -5,11 +5,13 @@
   .row
     .col-md-6
       .form-group.row
-        = f.label :title, _('Title'), class: 'col-form-label col-sm-2'
+        .col-form-label.col-sm-2
+          = f.label :title, _('Title')
         .col-sm-10
           = f.text_field :title, maxlength: 255, class: 'qa-milestone-title form-control', required: true, autofocus: true
       .form-group.row.milestone-description
-        = f.label :description, _('Description'), class: 'col-form-label col-sm-2'
+        .col-form-label.col-sm-2
+          = f.label :description, _('Description')
         .col-sm-10
           = render layout: 'projects/md_preview', locals: { url: preview_markdown_path(@project) } do
             = render 'projects/zen', f: f, attr: :description, classes: 'qa-milestone-description note-textarea', placeholder: _('Write milestone description...')

app/views/shared/milestones/_form_dates.html.haml

 .col-md-6
   .form-group.row
-    = f.label :start_date, "Start Date", class: "col-form-label col-sm-2"
+    .col-form-label.col-sm-2
+      = f.label :start_date, "Start Date"
     .col-sm-10
       = f.text_field :start_date, class: "datepicker form-control", placeholder: "Select start date", autocomplete: 'off'
       %a.inline.float-right.prepend-top-5.js-clear-start-date{ href: "#" } Clear start date
   .form-group.row
-    = f.label :due_date, "Due Date", class: "col-form-label col-sm-2"
+    .col-form-label.col-sm-2
+      = f.label :due_date, "Due Date"
     .col-sm-10
       = f.text_field :due_date, class: "datepicker form-control", placeholder: "Select due date", autocomplete: 'off'
       %a.inline.float-right.prepend-top-5.js-clear-due-date{ href: "#" } Clear due date

changelogs/unreleased/56764-poor-ui-on-milestone-validation-error-page.yml

+---
+title: Fix CSS grid on a new Project/Group Milestone
+merge_request: 24614
+author: Takuya Noguchi
+type: fixed