Gallery: Retain search filters when toggling card types

pkg/templates/template_funcs.go

@@ -7,6 +7,7 @@ import (
 	"html/template"
 	"net/http"
 	"net/url"
+	"sort"
 	"strings"
 	"time"
 
@@ -211,6 +212,10 @@ func QueryPlus(r *http.Request) func(...interface{}) template.URL {
 				)
 			}
 		}
+
+		// Sort them deterministically.
+		sort.Strings(parts)
+
 		return template.URL(strings.Join(parts, "&"))
 	}
 }

web/templates/photo/gallery.html

@@ -212,10 +212,10 @@
                         <div class="tabs is-toggle is-small is-hidden-mobile">
                             <ul>
                                 <li{{if eq .ViewStyle "cards"}} class="is-active"{{end}}>
-                                    <a href="{{.Request.URL.Path}}?view=cards">Cards</a>
+                                    <a href="{{.Request.URL.Path}}?{{QueryPlus "view" "cards"}}">Cards</a>
                                 </li>
                                 <li{{if eq .ViewStyle "full"}} class="is-active"{{end}}>
-                                    <a href="{{.Request.URL.Path}}?view=full">Full</a>
+                                    <a href="{{.Request.URL.Path}}?{{QueryPlus "view" "full"}}">Full</a>
                                 </li>
                             </ul>
                         </div>
@@ -345,6 +345,9 @@
                     </div>
                 </div>
 
+                <!-- Retain cards vs. full parameter -->
+                <input type="hidden" name="view" value="{{.ViewStyle}}">
+
                 </form>
             </div>