fix: migrate issue trackers of 2025.26

Starting with version 2025.26 (implemented in commits b345bb4 and
9802ac9 for issue #1599) the issue trackers configured in repository
settings are stored in a new format, deleting the issue trackers
configured before.

Since this breaks compatibility, now these issue trackers in the old
format used in versions up to 2025.26 are automatically migrated, so
they don't get lost.

Fixes #1725.

Author: sina-hide

src/App.JsonCodeGen.cs

@@ -65,6 +65,7 @@ public override void Write(Utf8JsonWriter writer, DataGridLength value, JsonSeri
     [JsonSerializable(typeof(Models.ThemeOverrides))]
     [JsonSerializable(typeof(Models.Version))]
     [JsonSerializable(typeof(Models.RepositorySettings))]
+    [JsonSerializable(typeof(Models.IssueTrackerMigrator.IssueTrackerRepositorySettingsVersion202526))]
     [JsonSerializable(typeof(List<Models.VisualStudioInstance>))]
     [JsonSerializable(typeof(ViewModels.Preferences))]
     internal partial class JsonCodeGen : JsonSerializerContext { }

src/Models/IssueTrackerMigrator.cs

@@ -0,0 +1,58 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text.Json;
+using Avalonia.Collections;
+
+namespace SourceGit.Models
+{
+    public static class IssueTrackerMigrator
+    {
+        public static IEnumerable<IssueTracker> Migrate(string gitDir)
+        {
+            var settingsFileVersion202526 = Path.Combine(gitDir, "sourcegit.settings");
+            var rules = ReadIssueTrackerSettings202526(settingsFileVersion202526);
+
+            var additionalIssueTrackers = rules.Select(rule => new IssueTracker
+            {
+                IsShared = false,
+                Name = rule.Name,
+                RegexString = rule.RegexString,
+                URLTemplate = rule.URLTemplate,
+            });
+
+            return additionalIssueTrackers;
+        }
+
+        private static IEnumerable<IssueTrackerRuleVersion202526> ReadIssueTrackerSettings202526(
+            string settingsFileVersion202526
+        )
+        {
+            if (!File.Exists(settingsFileVersion202526))
+                return [];
+
+            try
+            {
+                using var stream = File.OpenRead(settingsFileVersion202526);
+                var jsonTypeInfo = JsonCodeGen.Default.IssueTrackerRepositorySettingsVersion202526;
+                var settings = JsonSerializer.Deserialize(stream, jsonTypeInfo);
+                var rules = settings.IssueTrackerRules;
+                return rules ?? [];
+            }
+            catch
+            {
+                return [];
+            }
+        }
+
+        public record IssueTrackerRepositorySettingsVersion202526(
+            AvaloniaList<IssueTrackerRuleVersion202526> IssueTrackerRules
+        );
+
+        public record IssueTrackerRuleVersion202526(
+            string Name,
+            string RegexString,
+            string URLTemplate
+        );
+    }
+}

src/ViewModels/Repository.cs

@@ -784,6 +784,7 @@ public void RefreshAll()
                 var issuetrackers = new List<Models.IssueTracker>();
                 await CreateIssueTrackerCommand(true).ReadAllAsync(issuetrackers, true).ConfigureAwait(false);
                 await CreateIssueTrackerCommand(false).ReadAllAsync(issuetrackers, false).ConfigureAwait(false);
+                issuetrackers.AddRange(Models.IssueTrackerMigrator.Migrate(_gitDir));
                 Dispatcher.UIThread.Post(() =>
                 {
                     IssueTrackers.Clear();