Fix various problems around projects board view (#30696)

The previous implementation will start multiple POST requests from the
frontend when moving a column and another bug is moving the default
column will never be remembered in fact.

- [x] This PR will allow the default column to move to a non-first
position
- [x] And it also uses one request instead of multiple requests when
moving the columns
- [x] Use a star instead of a pin as the icon for setting the default
column action
- [x] Inserted new column will be append to the end
- [x] Fix #30701 the newly added issue will be append to the end of the
default column
- [x] Fix when deleting a column, all issues in it will be displayed
from UI but database records exist.
- [x] Add a limitation for columns in a project to 20. So the sorting
will not be overflow because it's int8.

---------

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
(cherry picked from commit a303c973e0264dab45a787c4afa200e183e0d953)

Conflicts:
	routers/web/web.go
	e91733468ef726fc9365aa4820cdd5f2ddfdaa23 Add missing database transaction for new issue (#29490) was not cherry-picked
	services/issue/issue.go
	fe6792dff3 Enable/disable owner and repo projects independently (#28805) was not cherry-picked

models/project/issue.go

@@ -9,6 +9,7 @@ import (
 
 	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/util"
 )
 
 // ProjectIssue saves relation from issue to a project
@@ -17,7 +18,7 @@ type ProjectIssue struct { //revive:disable-line:exported
 	IssueID   int64 `xorm:"INDEX"`
 	ProjectID int64 `xorm:"INDEX"`
 
-	// If 0, then it has not been added to a specific board in the project
+	// ProjectBoardID should not be zero since 1.22. If it's zero, the issue will not be displayed on UI and it might result in errors.
 	ProjectBoardID int64 `xorm:"INDEX"`
 
 	// the sorting order on the board
@@ -79,11 +80,8 @@ func (p *Project) NumOpenIssues(ctx context.Context) int {
 func MoveIssuesOnProjectBoard(ctx context.Context, board *Board, sortedIssueIDs map[int64]int64) error {
 	return db.WithTx(ctx, func(ctx context.Context) error {
 		sess := db.GetEngine(ctx)
+		issueIDs := util.ValuesOfMap(sortedIssueIDs)
 
-		issueIDs := make([]int64, 0, len(sortedIssueIDs))
-		for _, issueID := range sortedIssueIDs {
-			issueIDs = append(issueIDs, issueID)
-		}
 		count, err := sess.Table(new(ProjectIssue)).Where("project_id=?", board.ProjectID).In("issue_id", issueIDs).Count()
 		if err != nil {
 			return err
@@ -102,7 +100,44 @@ func MoveIssuesOnProjectBoard(ctx context.Context, board *Board, sortedIssueIDs
 	})
 }
 
-func (b *Board) removeIssues(ctx context.Context) error {
-	_, err := db.GetEngine(ctx).Exec("UPDATE `project_issue` SET project_board_id = 0 WHERE project_board_id = ? ", b.ID)
-	return err
+func (b *Board) moveIssuesToAnotherColumn(ctx context.Context, newColumn *Board) error {
+	if b.ProjectID != newColumn.ProjectID {
+		return fmt.Errorf("columns have to be in the same project")
+	}
+
+	if b.ID == newColumn.ID {
+		return nil
+	}
+
+	res := struct {
+		MaxSorting int64
+		IssueCount int64
+	}{}
+	if _, err := db.GetEngine(ctx).Select("max(sorting) as max_sorting, count(*) as issue_count").
+		Table("project_issue").
+		Where("project_id=?", newColumn.ProjectID).
+		And("project_board_id=?", newColumn.ID).
+		Get(&res); err != nil {
+		return err
+	}
+
+	issues, err := b.GetIssues(ctx)
+	if err != nil {
+		return err
+	}
+	if len(issues) == 0 {
+		return nil
+	}
+
+	nextSorting := util.Iif(res.IssueCount > 0, res.MaxSorting+1, 0)
+	return db.WithTx(ctx, func(ctx context.Context) error {
+		for i, issue := range issues {
+			issue.ProjectBoardID = newColumn.ID
+			issue.Sorting = nextSorting + int64(i)
+			if _, err := db.GetEngine(ctx).ID(issue.ID).Cols("project_board_id", "sorting").Update(issue); err != nil {
+				return err
+			}
+		}
+		return nil
+	})
 }