Adjust line number for working copy when editing a line

There are two ways to jump to the editor on a specific line: pressing `e` in the
staging or patch building panels, or clicking on a hyperlink in a delta diff. In
both cases, this works perfectly in the unstaged changes view, but in other
views (either staged changes, or an older commit) it can often jump to the wrong
line; this happens when there are further changes to the file being viewed in
later commits or in unstaged changes.

This commit fixes this so that you end up on the right line in these cases.

pkg/gui/context/branches_context.go

@@ -80,6 +80,14 @@ func (self *BranchesContext) GetDiffTerminals() []string {
 	return nil
 }
 
+func (self *BranchesContext) RefForAdjustingLineNumberInDiff() string {
+	branch := self.GetSelected()
+	if branch != nil {
+		return branch.ID()
+	}
+	return ""
+}
+
 func (self *BranchesContext) ShowBranchHeadsInSubCommits() bool {
 	return true
 }

pkg/gui/context/commit_files_context.go

@@ -77,6 +77,13 @@ func (self *CommitFilesContext) GetDiffTerminals() []string {
 	return []string{self.GetRef().RefName()}
 }
 
+func (self *CommitFilesContext) RefForAdjustingLineNumberInDiff() string {
+	if refs := self.GetRefRange(); refs != nil {
+		return refs.To.RefName()
+	}
+	return self.GetRef().RefName()
+}
+
 func (self *CommitFilesContext) GetFromAndToForDiff() (string, string) {
 	if refs := self.GetRefRange(); refs != nil {
 		return refs.From.ParentRefName(), refs.To.RefName()

pkg/gui/context/local_commits_context.go

@@ -170,6 +170,14 @@ func (self *LocalCommitsContext) GetDiffTerminals() []string {
 	return []string{itemId}
 }
 
+func (self *LocalCommitsContext) RefForAdjustingLineNumberInDiff() string {
+	commits, _, _ := self.GetSelectedItems()
+	if commits == nil {
+		return ""
+	}
+	return commits[0].Hash
+}
+
 func (self *LocalCommitsContext) ModelSearchResults(searchStr string, caseSensitive bool) []gocui.SearchPosition {
 	return searchModelCommits(caseSensitive, self.GetCommits(), self.ColumnPositions(), searchStr)
 }

pkg/gui/context/reflog_commits_context.go

@@ -86,6 +86,10 @@ func (self *ReflogCommitsContext) GetDiffTerminals() []string {
 	return []string{itemId}
 }
 
+func (self *ReflogCommitsContext) RefForAdjustingLineNumberInDiff() string {
+	return self.GetSelectedItemId()
+}
+
 func (self *ReflogCommitsContext) ShowBranchHeadsInSubCommits() bool {
 	return false
 }

pkg/gui/context/remote_branches_context.go

@@ -78,6 +78,10 @@ func (self *RemoteBranchesContext) GetDiffTerminals() []string {
 	return []string{itemId}
 }
 
+func (self *RemoteBranchesContext) RefForAdjustingLineNumberInDiff() string {
+	return self.GetSelectedItemId()
+}
+
 func (self *RemoteBranchesContext) ShowBranchHeadsInSubCommits() bool {
 	return true
 }

pkg/gui/context/remotes_context.go

@@ -53,3 +53,7 @@ func (self *RemotesContext) GetDiffTerminals() []string {
 
 	return []string{itemId}
 }
+
+func (self *RemotesContext) RefForAdjustingLineNumberInDiff() string {
+	return ""
+}

pkg/gui/context/stash_context.go

@@ -71,3 +71,7 @@ func (self *StashContext) GetDiffTerminals() []string {
 
 	return []string{itemId}
 }
+
+func (self *StashContext) RefForAdjustingLineNumberInDiff() string {
+	return self.GetSelectedItemId()
+}

pkg/gui/context/sub_commits_context.go

@@ -217,6 +217,14 @@ func (self *SubCommitsContext) GetDiffTerminals() []string {
 	return []string{itemId}
 }
 
+func (self *SubCommitsContext) RefForAdjustingLineNumberInDiff() string {
+	commits, _, _ := self.GetSelectedItems()
+	if commits == nil {
+		return ""
+	}
+	return commits[0].Hash
+}
+
 func (self *SubCommitsContext) ModelSearchResults(searchStr string, caseSensitive bool) []gocui.SearchPosition {
 	return searchModelCommits(caseSensitive, self.GetCommits(), self.ColumnPositions(), searchStr)
 }

pkg/gui/context/tags_context.go

@@ -66,6 +66,10 @@ func (self *TagsContext) GetDiffTerminals() []string {
 	return []string{itemId}
 }
 
+func (self *TagsContext) RefForAdjustingLineNumberInDiff() string {
+	return self.GetSelectedItemId()
+}
+
 func (self *TagsContext) ShowBranchHeadsInSubCommits() bool {
 	return true
 }