Thai tone marks and vowels at the end of the search term is wrongly removed. (#29071)

Co-authored-by: sukoom pornsuksiri <sukoom@mm.co.th>

server/public/model/search_params.go

@@ -11,7 +11,7 @@ import (
 )
 
 var searchTermPuncStart = regexp.MustCompile(`^[^\pL\d\s#"]+`)
-var searchTermPuncEnd = regexp.MustCompile(`[^\pL\d\s*"]+$`)
+var searchTermPuncEnd = regexp.MustCompile(`[^\pL\p{M}\d\s*"]+$`)
 
 type SearchParams struct {
 	Terms                  string   `json:"terms,omitempty"`

server/public/model/search_params_test.go

@@ -1011,6 +1011,50 @@ func TestParseSearchFlags2(t *testing.T) {
 				},
 			},
 		},
+		{
+			Name:  "string end with  thai upper vowel",
+			Input: "สวัสดี",
+			Words: []searchWord{
+				{
+					value:   "สวัสดี",
+					exclude: false,
+				},
+			},
+			Flags: []flag{},
+		},
+		{
+			Name:  "string end with  thai upper tone mark",
+			Input: "ที่นี่",
+			Words: []searchWord{
+				{
+					value:   "ที่นี่",
+					exclude: false,
+				},
+			},
+			Flags: []flag{},
+		},
+		{
+			Name:  "string end with  thai upper indication mark",
+			Input: "การันต์",
+			Words: []searchWord{
+				{
+					value:   "การันต์",
+					exclude: false,
+				},
+			},
+			Flags: []flag{},
+		},
+		{
+			Name:  "string end with  thai lower vowel",
+			Input: "กตัญญู",
+			Words: []searchWord{
+				{
+					value:   "กตัญญู",
+					exclude: false,
+				},
+			},
+			Flags: []flag{},
+		},
 	} {
 		t.Run(testCase.Name, func(t *testing.T) {
 			words, flags := parseSearchFlags(splitWords(testCase.Input))