fix: Unstable search behaviour

According to the GitHub API specification,
The structure of a query consists of one or more KEYWORDs and one
one more QUALIFIERs, as follows.

```
KEYWORD_1 KEYWORD_2 QUALIFIER_1 QUALIFIER_2
```

The character limit of query does not apply to QUALIFIERs, so the
part excluding the QUALIFIERs must be validated.

See-also: https://docs.github.com/en/rest/search/search?apiVersion=2022-11-28#limitations-on-query-length

Author: snaka

tagpr.go

@@ -606,28 +606,34 @@ func (tp *tagpr) generatenNextLabels(prIssues []*github.Issue) []string {
 	return nextLabels
 }
 
-func buildChunkSearchIssuesQuery(queryBase string, shasStr string) (chunkQueries []string) {
-	query := queryBase
+func buildChunkSearchIssuesQuery(qualifiers string, shasStr string) (chunkQueries []string) {
+	// array of SHAs
+	keywords := make([]string, 0, 25)
 	// Make bulk requests with multiple SHAs of the maximum possible length.
 	// If multiple SHAs are specified, the issue search API will treat it like an OR search,
-	// and all the pull requests will be searched.u
+	// and all the pull requests will be searched.
 	// This is difficult to read from the current documentation, but that is the current
 	// behavior and GitHub support has responded that this is the spec.
 	for _, sha := range strings.Split(shasStr, "\n") {
 		if strings.TrimSpace(sha) == "" {
 			continue
 		}
 		// Longer than 256 characters are not supported in the query.
+		// Note that the length limit does not include the qualifiers (ex. "repo:owner/repo", "is:close").
 		// ref. https://docs.github.com/en/rest/reference/search#limitations-on-query-length
-		if len(query)+1+len(sha) >= 256 {
-			chunkQueries = append(chunkQueries, query)
-			query = queryBase
+		//
+		// Also, from the results of the experiment, it is possible that when counting
+		// the number of characters in the keyword part, one space character is counted
+		//  as three characters (possibly '%20').
+		if len(strings.Join(keywords, "%20") + "%20" + sha) >= 256 {
+			chunkQueries = append(chunkQueries, qualifiers + " " + strings.Join(keywords, " "))
+			keywords = make([]string, 0, 25)
 		}
-		query += " " + sha
+		keywords = append(keywords, sha)
 	}
 
-	if query != queryBase {
-		chunkQueries = append(chunkQueries, query)
+	if len(keywords) > 0 {
+		chunkQueries = append(chunkQueries, qualifiers + " " + strings.Join(keywords, " "))
 	}
 
 	return chunkQueries

tagpr_test.go

@@ -100,9 +100,9 @@ def3db8
 c0fc143
 `,
 			[]string{
-				"repo:Songmu/tagpr is:pr is:closed 1a8bb97 1b7691b a9462b9 4d2b5e9 9ce4268 1eccbf8 1c3fbfc 968ade5 531c782 780bb71 6025fbf cc369ba a1f3e39 792bc85 3e3c4e1 37832de ac97702 d742186 217eb5d 0f900f7 5ef33d1 1d2ec15 2f37752 066ad7b 2e19b14 52b3706 f5134ae",
-				"repo:Songmu/tagpr is:pr is:closed ea39bbf 76b0630 ee3c6e6 2336be4 423a209 63caa74 3296052 3c98d78 86b8739 2264ec5 5c1d87b 4ffe09c 7c5d0de 3de9ed0 1b6b58c 2b643ec 53bf089 e8e96d5 3dac4b0 0605ba4 86cb76d 358c7c1 a139f86 33c16b6 c91f8ff a109671 b4029bd",
-				"repo:Songmu/tagpr is:pr is:closed f985b4f b74ef35 53d9ab3 6f57b07 0a84d90 43aa57d 75b6f79 def3db8 c0fc143",
+				"repo:Songmu/tagpr is:pr is:closed 1a8bb97 1b7691b a9462b9 4d2b5e9 9ce4268 1eccbf8 1c3fbfc 968ade5 531c782 780bb71 6025fbf cc369ba a1f3e39 792bc85 3e3c4e1 37832de ac97702 d742186 217eb5d 0f900f7 5ef33d1 1d2ec15 2f37752 066ad7b 2e19b14",
+				"repo:Songmu/tagpr is:pr is:closed 52b3706 f5134ae ea39bbf 76b0630 ee3c6e6 2336be4 423a209 63caa74 3296052 3c98d78 86b8739 2264ec5 5c1d87b 4ffe09c 7c5d0de 3de9ed0 1b6b58c 2b643ec 53bf089 e8e96d5 3dac4b0 0605ba4 86cb76d 358c7c1 a139f86",
+				"repo:Songmu/tagpr is:pr is:closed 33c16b6 c91f8ff a109671 b4029bd f985b4f b74ef35 53d9ab3 6f57b07 0a84d90 43aa57d 75b6f79 def3db8 c0fc143",
 			},
 		},
 		{
@@ -132,11 +132,9 @@ d742186
 2f37752
 066ad7b
 2e19b14
-52b3706
-f5134ae
 `,
 			[]string{
-				"repo:Songmu/tagpr is:pr is:closed 1a8bb97 1b7691b a9462b9 4d2b5e9 9ce4268 1eccbf8 1c3fbfc 968ade5 531c782 780bb71 6025fbf cc369ba a1f3e39 792bc85 3e3c4e1 37832de ac97702 d742186 217eb5d 0f900f7 5ef33d1 1d2ec15 2f37752 066ad7b 2e19b14 52b3706 f5134ae",
+				"repo:Songmu/tagpr is:pr is:closed 1a8bb97 1b7691b a9462b9 4d2b5e9 9ce4268 1eccbf8 1c3fbfc 968ade5 531c782 780bb71 6025fbf cc369ba a1f3e39 792bc85 3e3c4e1 37832de ac97702 d742186 217eb5d 0f900f7 5ef33d1 1d2ec15 2f37752 066ad7b 2e19b14",
 			},
 		},
 	}