Issue and Pulls lists rework (#13594)

* Issue and Pulls lists rework

Reorganized and restyled the issue and pull request lists.

* color and layout tweaks

* use new issue list on dashboard as well

* move pagination into template

* misc tweaks

* fix label hover

* fix milestone list

* fix discrepancies between issue and milestone list, add new 'merge' helper

* fmt

* simplify merge helper

* remove whitespace

* fix startIndex

* further simplify dict merging

* rename helper to 'mergeinto' for clarity

* allow bottom-row to wrap

Co-authored-by: Lauris BH <lauris@nix.lv>

modules/templates/helper.go

@@ -256,31 +256,27 @@ func NewFuncMap() []template.FuncMap {
 		"DefaultTheme": func() string {
 			return setting.UI.DefaultTheme
 		},
+		// pass key-value pairs to a partial template which receives them as a dict
 		"dict": func(values ...interface{}) (map[string]interface{}, error) {
 			if len(values) == 0 {
 				return nil, errors.New("invalid dict call")
 			}
 
 			dict := make(map[string]interface{})
-
-			for i := 0; i < len(values); i++ {
-				switch key := values[i].(type) {
-				case string:
-					i++
-					if i == len(values) {
-						return nil, errors.New("specify the key for non array values")
-					}
-					dict[key] = values[i]
-				case map[string]interface{}:
-					m := values[i].(map[string]interface{})
-					for i, v := range m {
-						dict[i] = v
-					}
-				default:
-					return nil, errors.New("dict values must be maps")
-				}
+			return util.MergeInto(dict, values...)
+		},
+		/* like dict but merge key-value pairs into the first dict and return it */
+		"mergeinto": func(root map[string]interface{}, values ...interface{}) (map[string]interface{}, error) {
+			if len(values) == 0 {
+				return nil, errors.New("invalid mergeinto call")
 			}
-			return dict, nil
+
+			dict := make(map[string]interface{})
+			for key, value := range root {
+				dict[key] = value
+			}
+
+			return util.MergeInto(dict, values...)
 		},
 		"percentage": func(n int, values ...int) float32 {
 			var sum = 0