Sidepanel: Keep revisions opening a new instance (gitextensions#10146)

When launching a new GE instance from the sidepanel, set
first/last selected revisions in the grid as first/second in
the new instance.

GitUI/BranchTreePanel/SubmoduleNode.cs

@@ -5,6 +5,7 @@
 using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
+using System.Windows.Forms;
 using GitCommands;
 using GitCommands.Git;
 using GitCommands.Submodules;
@@ -84,7 +85,23 @@ public void LaunchGitExtensions()
  return;
  }
 
- GitUICommands.LaunchBrowse(workingDir: Info.Path.EnsureTrailingPathSeparator(), ObjectId.WorkTreeId, Info?.Detailed?.RawStatus?.OldCommit);
+ ObjectId? selected;
+ ObjectId? first;
+ if (IsCurrent)
+ {
+ // Get the current (most likely) selections from the grid
+ IReadOnlyList<GitRevision>? revs = UICommands.GetSelectedRevisions() ?? new List<GitRevision>();
+ selected = revs.Count > 0 ? revs[0].ObjectId : null;
+ first = revs.Count > 1 ? revs[revs.Count - 1].ObjectId : null;
+ }
+ else
+ {
+ // Try select a "diff" from the expected commit to worktree for a submodule
+ selected = ObjectId.WorkTreeId;
+ first = Info?.Detailed?.RawStatus?.OldCommit;
+ }
+
+ GitUICommands.LaunchBrowse(workingDir: Info.Path.EnsureTrailingPathSeparator(), selected, first);
  }
 
  internal override void OnSelected()

GitUI/CommandsDialogs/FormBrowse.cs

@@ -650,6 +650,11 @@ public void GoToRef(string refName, bool showNoRevisionMsg, bool toggleSelection
  }
  }
 
+ public IReadOnlyList<GitRevision> GetSelectedRevisions()
+ {
+ return RevisionGrid.GetSelectedRevisions();
+ }
+
  #endregion
 
  public void SetPathFilter(string pathFilter)

GitUI/GitUICommands.cs

@@ -1905,6 +1905,11 @@ public void BrowseSetWorkingDir(string path, ObjectId? selectedId = null, Object
  BrowseRepo?.SetWorkingDir(path, selectedId, firstId);
  }
 
+ public IReadOnlyList<GitRevision>? GetSelectedRevisions()
+ {
+ return BrowseRepo?.GetSelectedRevisions();
+ }
+
  public IGitRemoteCommand CreateRemoteCommand()
  {
  return new GitRemoteCommand(this);

Plugins/GitUIPluginInterfaces/IBrowseRepo.cs

@@ -1,8 +1,11 @@
-namespace GitUIPluginInterfaces
+using System.Collections.Generic;
+
+namespace GitUIPluginInterfaces
 {
  public interface IBrowseRepo
  {
  void GoToRef(string refName, bool showNoRevisionMsg, bool toggleSelection = false);
  void SetWorkingDir(string? path, ObjectId? selectedId = null, ObjectId? firstId = null);
+ IReadOnlyList<GitRevision> GetSelectedRevisions();
  }
 }