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/board_test.go

@@ -4,6 +4,8 @@
 package project
 
 import (
+	"fmt"
+	"strings"
 	"testing"
 
 	"code.gitea.io/gitea/models/db"
@@ -19,7 +21,7 @@ func TestGetDefaultBoard(t *testing.T) {
 	assert.NoError(t, err)
 
 	// check if default board was added
-	board, err := projectWithoutDefault.getDefaultBoard(db.DefaultContext)
+	board, err := projectWithoutDefault.GetDefaultBoard(db.DefaultContext)
 	assert.NoError(t, err)
 	assert.Equal(t, int64(5), board.ProjectID)
 	assert.Equal(t, "Uncategorized", board.Title)
@@ -28,7 +30,7 @@ func TestGetDefaultBoard(t *testing.T) {
 	assert.NoError(t, err)
 
 	// check if multiple defaults were removed
-	board, err = projectWithMultipleDefaults.getDefaultBoard(db.DefaultContext)
+	board, err = projectWithMultipleDefaults.GetDefaultBoard(db.DefaultContext)
 	assert.NoError(t, err)
 	assert.Equal(t, int64(6), board.ProjectID)
 	assert.Equal(t, int64(9), board.ID)
@@ -42,3 +44,84 @@ func TestGetDefaultBoard(t *testing.T) {
 	assert.Equal(t, int64(6), board.ProjectID)
 	assert.False(t, board.Default)
 }
+
+func Test_moveIssuesToAnotherColumn(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	column1 := unittest.AssertExistsAndLoadBean(t, &Board{ID: 1, ProjectID: 1})
+
+	issues, err := column1.GetIssues(db.DefaultContext)
+	assert.NoError(t, err)
+	assert.Len(t, issues, 1)
+	assert.EqualValues(t, 1, issues[0].ID)
+
+	column2 := unittest.AssertExistsAndLoadBean(t, &Board{ID: 2, ProjectID: 1})
+	issues, err = column2.GetIssues(db.DefaultContext)
+	assert.NoError(t, err)
+	assert.Len(t, issues, 1)
+	assert.EqualValues(t, 3, issues[0].ID)
+
+	err = column1.moveIssuesToAnotherColumn(db.DefaultContext, column2)
+	assert.NoError(t, err)
+
+	issues, err = column1.GetIssues(db.DefaultContext)
+	assert.NoError(t, err)
+	assert.Len(t, issues, 0)
+
+	issues, err = column2.GetIssues(db.DefaultContext)
+	assert.NoError(t, err)
+	assert.Len(t, issues, 2)
+	assert.EqualValues(t, 3, issues[0].ID)
+	assert.EqualValues(t, 0, issues[0].Sorting)
+	assert.EqualValues(t, 1, issues[1].ID)
+	assert.EqualValues(t, 1, issues[1].Sorting)
+}
+
+func Test_MoveColumnsOnProject(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	project1 := unittest.AssertExistsAndLoadBean(t, &Project{ID: 1})
+	columns, err := project1.GetBoards(db.DefaultContext)
+	assert.NoError(t, err)
+	assert.Len(t, columns, 3)
+	assert.EqualValues(t, 0, columns[0].Sorting) // even if there is no default sorting, the code should also work
+	assert.EqualValues(t, 0, columns[1].Sorting)
+	assert.EqualValues(t, 0, columns[2].Sorting)
+
+	err = MoveColumnsOnProject(db.DefaultContext, project1, map[int64]int64{
+		0: columns[1].ID,
+		1: columns[2].ID,
+		2: columns[0].ID,
+	})
+	assert.NoError(t, err)
+
+	columnsAfter, err := project1.GetBoards(db.DefaultContext)
+	assert.NoError(t, err)
+	assert.Len(t, columnsAfter, 3)
+	assert.EqualValues(t, columns[1].ID, columnsAfter[0].ID)
+	assert.EqualValues(t, columns[2].ID, columnsAfter[1].ID)
+	assert.EqualValues(t, columns[0].ID, columnsAfter[2].ID)
+}
+
+func Test_NewBoard(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	project1 := unittest.AssertExistsAndLoadBean(t, &Project{ID: 1})
+	columns, err := project1.GetBoards(db.DefaultContext)
+	assert.NoError(t, err)
+	assert.Len(t, columns, 3)
+
+	for i := 0; i < maxProjectColumns-3; i++ {
+		err := NewBoard(db.DefaultContext, &Board{
+			Title:     fmt.Sprintf("board-%d", i+4),
+			ProjectID: project1.ID,
+		})
+		assert.NoError(t, err)
+	}
+	err = NewBoard(db.DefaultContext, &Board{
+		Title:     "board-21",
+		ProjectID: project1.ID,
+	})
+	assert.Error(t, err)
+	assert.True(t, strings.Contains(err.Error(), "maximum number of columns reached"))
+}