From afe8e82a06ad7470cbefa811c434c4f0400a70d0 Mon Sep 17 00:00:00 2001
From: Johannes Altmanninger <aclopte@gmail.com>
Date: Mon, 27 Apr 2020 23:29:21 +0200
Subject: [PATCH] Compute line number before diff application in
 diff_get_lineno

---
 include/tig/diff.h |  2 +-
 src/diff.c         | 16 ++++++++--------
 src/stage.c        |  4 ++--
 3 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/include/tig/diff.h b/include/tig/diff.h
index f7cb97507..4e8730880 100644
--- a/include/tig/diff.h
+++ b/include/tig/diff.h
@@ -40,7 +40,7 @@ void diff_restore_line(struct view *view, struct diff_state *state);
 enum status_code diff_init_highlight(struct view *view, struct diff_state *state);
 bool diff_done_highlight(struct diff_state *state);
 
-unsigned int diff_get_lineno(struct view *view, struct line *line);
+unsigned int diff_get_lineno(struct view *view, struct line *line, bool old);
 const char *diff_get_pathname(struct view *view, struct line *line);
 
 extern struct view diff_view;
diff --git a/src/diff.c b/src/diff.c
index e38162c12..211ca8943 100644
--- a/src/diff.c
+++ b/src/diff.c
@@ -451,7 +451,7 @@ diff_save_line(struct view *view, struct diff_state *state, enum open_flags flag
 
 		if (file) {
 			state->file = get_path(file);
-			state->lineno = diff_get_lineno(view, line);
+			state->lineno = diff_get_lineno(view, line, false);
 			state->pos = view->pos;
 		}
 	}
@@ -479,7 +479,7 @@ diff_restore_line(struct view *view, struct diff_state *state)
 		return;
 
 	while ((line = find_next_line_by_type(view, line, LINE_DIFF_CHUNK))) {
-		unsigned int lineno = diff_get_lineno(view, line);
+		unsigned int lineno = diff_get_lineno(view, line, false);
 
 		for (line++; view_has_line(view, line) && line->type != LINE_DIFF_CHUNK; line++) {
 			if (lineno == state->lineno) {
@@ -605,7 +605,7 @@ diff_blame_line(const char *ref, const char *file, unsigned long lineno,
 }
 
 unsigned int
-diff_get_lineno(struct view *view, struct line *line)
+diff_get_lineno(struct view *view, struct line *line, bool old)
 {
 	const struct line *header, *chunk;
 	unsigned int lineno;
@@ -625,11 +625,11 @@ diff_get_lineno(struct view *view, struct line *line)
 	if (!parse_chunk_header(&chunk_header, box_text(chunk)))
 		return 0;
 
-	lineno = chunk_header.new.position;
+	lineno = old ? chunk_header.old.position : chunk_header.new.position;
 
 	for (chunk++; chunk < line; chunk++)
-		if (chunk->type != LINE_DIFF_DEL &&
-		    chunk->type != LINE_DIFF_DEL2)
+		if (old ? chunk->type != LINE_DIFF_ADD && chunk->type != LINE_DIFF_ADD2
+			: chunk->type != LINE_DIFF_DEL && chunk->type != LINE_DIFF_DEL2)
 			lineno++;
 
 	return lineno;
@@ -761,7 +761,7 @@ diff_common_edit(struct view *view, enum request request, struct line *line)
 		lineno = view->env->lineno;
 	} else {
 		file = diff_get_pathname(view, line);
-		lineno = diff_get_lineno(view, line);
+		lineno = diff_get_lineno(view, line, false);
 	}
 
 	if (!file) {
@@ -827,7 +827,7 @@ diff_common_select(struct view *view, struct line *line, const char *changes_msg
 			if (changes_msg)
 				string_format(view->ref, "%s to '%s'", changes_msg, file);
 			string_format(view->env->file, "%s", file);
-			view->env->lineno = view->env->goto_lineno = diff_get_lineno(view, line);
+			view->env->lineno = view->env->goto_lineno = diff_get_lineno(view, line, false);
 			view->env->blob[0] = 0;
 		} else {
 			string_ncopy(view->ref, view->ops->id, strlen(view->ops->id));
diff --git a/src/stage.c b/src/stage.c
index 565c946a0..6623cc36b 100644
--- a/src/stage.c
+++ b/src/stage.c
@@ -420,7 +420,7 @@ stage_request(struct view *view, enum request request, struct line *line)
 		if (stage_line_type == LINE_STAT_UNTRACKED) {
 			open_editor(stage_status.new.name, (line - view->line) + 1);
 		} else {
-			open_editor(stage_status.new.name, diff_get_lineno(view, line));
+			open_editor(stage_status.new.name, diff_get_lineno(view, line, false));
 		}
 		break;
 
@@ -445,7 +445,7 @@ stage_request(struct view *view, enum request request, struct line *line)
 		}
 
 		view->env->ref[0] = 0;
-		view->env->goto_lineno = diff_get_lineno(view, line);
+		view->env->goto_lineno = diff_get_lineno(view, line, false);
 		if (view->env->goto_lineno > 0)
 			view->env->goto_lineno--;
 		return request;