Allow both fullname and username search when `DEFAULT_SHOW_FULL_NAME` is true (#23463)

This PR adds the ability to search both fullname and username for
assignees, reviewers and author search boxes when the config
[`DEFAULT_SHOW_FULL_NAME`](https://github.com/go-gitea/gitea/blob/6ff5400af91aefb02cbc7dd59f6be23cc2bf7865/custom/conf/app.example.ini#L1238)
in `app.ini` is set to `true`. Which is originally raised
[here](https://projects.blender.org/infrastructure/blender-projects-platform/issues/14)
And if `DEFAULT_SHOW_FULL_NAME` is set to `false`(default value), these
search boxes will only show username.

Example:
When `DEFAULT_SHOW_FULL_NAME = true`

<img width="1220" alt="截屏2023-03-14 14 28 06"
src="https://user-images.githubusercontent.com/17645053/224914546-80ef2837-ab72-4d66-9f00-6eb77ed4baaa.png">

When `DEFAULT_SHOW_FULL_NAME = false` (default value)

<img width="1243" alt="截屏2023-03-14 14 29 37"
src="https://user-images.githubusercontent.com/17645053/224914798-f69ec8a2-0929-4330-827c-3e30188f9b47.png">


The specific search boxes that adapts these changes include:
1. Author, Assignee search boxes in pull requests tab and issues tab in
repository
<img width="1283" alt="截屏2023-03-14 14 35 01"
src="https://user-images.githubusercontent.com/17645053/224916250-8e452525-71d6-4b48-bf1c-bf7a176abaaa.png">

2. Assigee and Author on milestones issue page (Added missing search box
for author here)
<img width="1261" alt="截屏2023-03-14 14 38 20"
src="https://user-images.githubusercontent.com/17645053/224916569-d3105619-7824-4bb8-a6d0-1a600eaa9963.png">

3. Assignee on issues and PR Sidebar, Reviewer on PR Sidebar
<img width="976" alt="截屏2023-03-14 14 41 06"
src="https://user-images.githubusercontent.com/17645053/224917431-c45d821e-9660-4f58-a196-5979a0bb64ce.png">

<img width="1027" alt="截屏2023-03-14 14 41 58"
src="https://user-images.githubusercontent.com/17645053/224917290-ad4dbc52-0c20-45c4-9fce-9dcd59ad7d47.png">

4. Assignee when creating new issue
<img width="961" alt="截屏2023-03-14 14 44 33"
src="https://user-images.githubusercontent.com/17645053/224917694-34bee5a7-e975-4f37-8862-56ebc2556808.png">

5. Whitelisted users for pushing, Whitelisted users for merging and
Whitelisted reviewers in Protected branch settings
<img width="920" alt="截屏2023-03-14 14 48 56"
src="https://user-images.githubusercontent.com/17645053/224918551-9b46b44e-b075-4895-8d33-1aafc7d3c8e5.png">
<img width="901" alt="截屏2023-03-14 14 49 02"
src="https://user-images.githubusercontent.com/17645053/224918584-efa66f23-a593-4e26-a3eb-bb1fbc5516ae.png">
<img width="944" alt="截屏2023-03-14 14 49 21"
src="https://user-images.githubusercontent.com/17645053/224918591-be60455d-0513-4f66-84f6-b5e1bc40ff91.png">


6.  "Allowed users" in tags settings
<img width="935" alt="截屏2023-03-14 14 50 11"
src="https://user-images.githubusercontent.com/17645053/224918701-797699aa-c7e5-4290-b3fe-27dcead1c6c7.png">

9 files changed, 23 insertions, 18 deletions

diff --git a/modules/templates/helper.go b/modules/templates/helper.go
index 822bbbd9b1..a8343428dc 100644
--- a/modules/templates/helper.go
+++ b/modules/templates/helper.go
@@ -109,6 +109,9 @@ func NewFuncMap() []template.FuncMap {
 		"CustomEmojis": func() map[string]string {
 			return setting.UI.CustomEmojisMap
 		},
+		"IsShowFullName": func() bool {
+			return setting.UI.DefaultShowFullName
+		},
 		"Safe":           Safe,
 		"SafeJS":         SafeJS,
 		"JSEscape":       JSEscape,
diff --git a/templates/repo/issue/list.tmpl b/templates/repo/issue/list.tmpl
index 36faf86113..975d659470 100644
--- a/templates/repo/issue/list.tmpl
+++ b/templates/repo/issue/list.tmpl
@@ -134,7 +134,7 @@
 							<a class="item" href="{{$.Link}}?q={{$.Keyword}}&type={{$.ViewType}}&sort={{$.SortType}}&state={{$.State}}&labels={{.SelectLabels}}&milestone={{$.MilestoneID}}&project={{$.ProjectID}}&assignee={{$.AssigneeID}}">{{.locale.Tr "repo.issues.filter_poster_no_select"}}</a>
 							{{range .Posters}}
 								<a class="{{if eq $.PosterID .ID}}active selected{{end}} item" href="{{$.Link}}?type={{$.ViewType}}&sort={{$.SortType}}&state={{$.State}}&labels={{$.SelectLabels}}&milestone={{$.MilestoneID}}&project={{$.ProjectID}}&assignee={{$.AssigneeID}}&poster={{.ID}}">
-									{{avatar $.Context .}} {{.GetDisplayName}}
+									{{avatar $.Context .}}{{template "repo/search_name" .}}
 								</a>
 							{{end}}
 						</div>
@@ -154,7 +154,7 @@
 							<a class="item" href="{{$.Link}}?q={{$.Keyword}}&type={{$.ViewType}}&sort={{$.SortType}}&state={{$.State}}&labels={{.SelectLabels}}&milestone={{$.MilestoneID}}&project={{$.ProjectID}}&poster={{$.PosterID}}">{{.locale.Tr "repo.issues.filter_assginee_no_select"}}</a>
 							{{range .Assignees}}
 								<a class="{{if eq $.AssigneeID .ID}}active selected{{end}} item" href="{{$.Link}}?type={{$.ViewType}}&sort={{$.SortType}}&state={{$.State}}&labels={{$.SelectLabels}}&milestone={{$.MilestoneID}}&project={{$.ProjectID}}&assignee={{.ID}}&poster={{$.PosterID}}">
-									{{avatar $.Context .}} {{.GetDisplayName}}
+									{{avatar $.Context .}}{{template "repo/search_name" .}}
 								</a>
 							{{end}}
 						</div>
diff --git a/templates/repo/issue/milestone_issues.tmpl b/templates/repo/issue/milestone_issues.tmpl
index b4f036d32a..cb20fb0c56 100644
--- a/templates/repo/issue/milestone_issues.tmpl
+++ b/templates/repo/issue/milestone_issues.tmpl
@@ -70,10 +70,14 @@
 							{{svg "octicon-triangle-down" 14 "dropdown icon"}}
 						</span>
 						<div class="menu">
+							<div class="ui icon search input">
+								<i class="icon gt-df gt-ac gt-jc">{{svg "octicon-search" 16}}</i>
+								<input type="text" placeholder="{{.locale.Tr "repo.issues.filter_poster"}}">
+							</div>
 							<a class="item" href="{{$.Link}}?q={{$.Keyword}}&type={{$.ViewType}}&sort={{$.SortType}}&state={{$.State}}&labels={{.SelectLabels}}&assignee={{$.AssigneeID}}">{{.locale.Tr "repo.issues.filter_poster_no_select"}}</a>
 							{{range .Posters}}
 								<a class="{{if eq $.PosterID .ID}}active selected{{end}} item" href="{{$.Link}}?type={{$.ViewType}}&sort={{$.SortType}}&state={{$.State}}&labels={{$.SelectLabels}}&assignee={{$.AssigneeID}}&poster={{.ID}}">
-									{{avatar $.Context .}} {{.GetDisplayName}}
+									{{avatar $.Context .}}{{template "repo/search_name" .}}
 								</a>
 							{{end}}
 						</div>
@@ -93,8 +97,7 @@
 							<a class="item" href="{{$.Link}}?q={{$.Keyword}}&type={{$.ViewType}}&sort={{$.SortType}}&state={{$.State}}&labels={{.SelectLabels}}&poster={{$.PosterID}}">{{.locale.Tr "repo.issues.filter_assginee_no_select"}}</a>
 							{{range .Assignees}}
 								<a class="{{if eq $.AssigneeID .ID}}active selected{{end}} item" href="{{$.Link}}?type={{$.ViewType}}&sort={{$.SortType}}&state={{$.State}}&labels={{$.SelectLabels}}&assignee={{.ID}}&poster={{$.PosterID}}">
-									{{avatar $.Context . 28 "gt-mr-2"}}
-									{{.GetDisplayName}}
+									{{avatar $.Context . 28 "gt-mr-2"}}{{template "repo/search_name" .}}
 								</a>
 							{{end}}
 						</div>
diff --git a/templates/repo/issue/new_form.tmpl b/templates/repo/issue/new_form.tmpl
index a99ceb0451..b45a00f781 100644
--- a/templates/repo/issue/new_form.tmpl
+++ b/templates/repo/issue/new_form.tmpl
@@ -186,7 +186,7 @@
 							<a class="item muted" href="#" data-id="{{.ID}}" data-id-selector="#assignee_{{.ID}}">
 								<span class="octicon-check invisible">{{svg "octicon-check"}}</span>
 								<span class="text">
-									{{avatar $.Context . 28 "gt-mr-3"}}{{.GetDisplayName}}
+									{{avatar $.Context . 28 "gt-mr-3"}}{{template "repo/search_name" .}}
 								</span>
 							</a>
 						{{end}}
diff --git a/templates/repo/issue/view_content/sidebar.tmpl b/templates/repo/issue/view_content/sidebar.tmpl
index 165dca7e0c..40d87b4178 100644
--- a/templates/repo/issue/view_content/sidebar.tmpl
+++ b/templates/repo/issue/view_content/sidebar.tmpl
@@ -26,8 +26,7 @@
 								<a class="{{if not .CanChange}}ui tooltip{{end}} item {{if .Checked}} checked {{end}} {{if not .CanChange}}ban-change{{end}}" href="#" data-id="{{.ItemID}}" data-id-selector="#review_request_{{.ItemID}}" {{if not .CanChange}} data-content="{{$.locale.Tr "repo.issues.remove_request_review_block"}}"{{end}}>
 									<span class="octicon-check {{if not .Checked}}invisible{{end}}">{{svg "octicon-check"}}</span>
 									<span class="text">
-										{{avatar $.Context .User 28 "gt-mr-3"}}
-										{{.User.GetDisplayName}}
+										{{avatar $.Context .User 28 "gt-mr-3"}}{{template "repo/search_name" .User}}
 									</span>
 								</a>
 							{{end}}
@@ -258,8 +257,7 @@
 						{{end}}
 						<span class="octicon-check {{if not $checked}}invisible{{end}}">{{svg "octicon-check"}}</span>
 						<span class="text">
-							{{avatar $.Context . 28 "gt-mr-3"}}
-							{{.GetDisplayName}}
+							{{avatar $.Context . 28 "gt-mr-3"}}{{template "repo/search_name" .}}
 						</span>
 					</a>
 				{{end}}
diff --git a/templates/repo/search_name.tmpl b/templates/repo/search_name.tmpl
new file mode 100644
index 0000000000..468f6c394c
--- /dev/null
+++ b/templates/repo/search_name.tmpl
@@ -0,0 +1 @@
+{{.Name}}{{if IsShowFullName}}<span class="search-fullname"> {{.FullName}}</span>{{end}}
diff --git a/templates/repo/settings/protected_branch.tmpl b/templates/repo/settings/protected_branch.tmpl
index 88350c5999..d63fed46bc 100644
--- a/templates/repo/settings/protected_branch.tmpl
+++ b/templates/repo/settings/protected_branch.tmpl
@@ -49,8 +49,7 @@
 								<div class="menu">
 									{{range .Users}}
 										<div class="item" data-value="{{.ID}}">
-											{{avatar $.Context . 28 "mini"}}
-											{{.GetDisplayName}}
+											{{avatar $.Context . 28 "mini"}}{{template "repo/search_name" .}}
 										</div>
 									{{end}}
 								</div>
@@ -101,8 +100,7 @@
 								<div class="menu">
 								{{range .Users}}
 									<div class="item" data-value="{{.ID}}">
-										{{avatar $.Context . 28 "mini"}}
-									{{.GetDisplayName}}
+										{{avatar $.Context . 28 "mini"}}{{template "repo/search_name" .}}
 									</div>
 								{{end}}
 								</div>
@@ -181,8 +179,7 @@
 								<div class="menu">
 								{{range .Users}}
 									<div class="item" data-value="{{.ID}}">
-										{{avatar $.Context . 28 "mini"}}
-									{{.GetDisplayName}}
+										{{avatar $.Context . 28 "mini"}}{{template "repo/search_name" .}}
 									</div>
 								{{end}}
 								</div>
diff --git a/templates/repo/settings/tags.tmpl b/templates/repo/settings/tags.tmpl
index 7b318955ec..aa23c6a57d 100644
--- a/templates/repo/settings/tags.tmpl
+++ b/templates/repo/settings/tags.tmpl
@@ -36,8 +36,7 @@
 										<div class="menu">
 											{{range .Users}}
 												<div class="item" data-value="{{.ID}}">
-													{{avatar $.Context . 28 "mini"}}
-													{{.GetDisplayName}}
+													{{avatar $.Context . 28 "mini"}}{{template "repo/search_name" .}}
 												</div>
 											{{end}}
 										</div>
diff --git a/web_src/css/repository.css b/web_src/css/repository.css
index ad2ac49b99..bebe3ff8f4 100644
--- a/web_src/css/repository.css
+++ b/web_src/css/repository.css
@@ -3627,3 +3627,7 @@ td.blob-excerpt {
 .pr-status .status-details > span {
   padding-right: 0.5em; /* To match the alignment with the "required" label */
 }
+
+.search-fullname {
+  color: var(--color-text-light-2);
+}