Fix the Manually Merged form (#23015)

Regression bug of #19650

Close #20983
Close #21912

### The "Manually Merged" form

![image](https://user-images.githubusercontent.com/2114189/220170503-32638994-b509-4251-8aa1-d8393dda7184.png)

### Mark a PR as Manually Merged and close it

![image](https://user-images.githubusercontent.com/2114189/220170537-25c91b2c-7a9a-44d1-9e6a-ebe3f1dfc26a.png)

---------

Co-authored-by: Jason Song <i@wolfogre.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

templates/repo/issue/view_content/pull.tmpl

@@ -129,6 +129,7 @@
 	<div class="content">
 		{{template "repo/pulls/status" .}}
 		{{$canAutoMerge := false}}
+		{{$showGeneralMergeForm := false}}
 		<div class="ui attached merge-section segment {{if not $.LatestCommitStatus}}no-header{{end}}">
 			{{if .Issue.PullRequest.HasMerged}}
 				<div class="item text">
@@ -320,6 +321,7 @@
 								'textAutoMergeCancelSchedule': {{$.locale.Tr "repo.pulls.auto_merge_cancel_schedule"}},
 								'textClearMergeMessage': {{$.locale.Tr "repo.pulls.clear_merge_message"}},
 								'textClearMergeMessageHint': {{$.locale.Tr "repo.pulls.clear_merge_message_hint"}},
+								'textMergeCommitId': {{$.locale.Tr "repo.pulls.merge_commit_id"}},
 
 								'canMergeNow': {{$canMergeNow}},
 								'allOverridableChecksOk': {{not $notAllOverridableChecksOk}},
@@ -379,6 +381,7 @@
 							window.config.pageData.pullRequestMergeForm = mergeForm;
 						</script>
 
+						{{$showGeneralMergeForm = true}}
 						<div id="pull-request-merge-form"></div>
 					{{else}}
 						{{/* no merge style was set in repo setting: not or ($prUnit.PullRequestsConfig.AllowMerge ...) */}}
@@ -452,11 +455,11 @@
 						{{$.locale.Tr "repo.pulls.cannot_auto_merge_helper"}}
 					</div>
 				{{end}}
-			{{end}}
+			{{end}}{{/* end if: pull request status */}}
 
-			{{if $.StillCanManualMerge}}
+			{{if and $.StillCanManualMerge (not $showGeneralMergeForm)}}
 				<div class="ui divider"></div>
-				<div class="ui form manually-merged-fields gt-hidden">
+				<div class="ui form">
 					<form action="{{.Link}}/merge" method="post">
 						{{.CsrfTokenHtml}}
 						<div class="field">
@@ -465,17 +468,8 @@
 						<button class="ui red button" type="submit" name="do" value="manually-merged">
 							{{$.locale.Tr "repo.pulls.merge_manually"}}
 						</button>
-						<button class="ui button merge-cancel">
-							{{$.locale.Tr "cancel"}}
-						</button>
 					</form>
 				</div>
-
-				<div class="ui red buttons merge-button">
-					<button class="ui button" data-do="manually-merged">
-						{{$.locale.Tr "repo.pulls.merge_manually"}}
-					</button>
-				</div>
 			{{end}}
 
 			{{if and .ShowMergeInstructions .Issue.PullRequest.HeadRepo}}

web_src/js/components/PullRequestMergeForm.vue

@@ -36,6 +36,10 @@
           </div>
         </template>
 
+        <div class="field" v-if="mergeStyle === 'manually-merged'">
+          <input type="text" name="merge_commit_id" :placeholder="mergeForm.textMergeCommitId">
+        </div>
+
         <button class="ui button" :class="mergeButtonStyleClass" type="submit" name="do" :value="mergeStyle">
           {{ mergeStyleDetail.textDoMerge }}
           <template v-if="autoMergeWhenSucceed">