feat(log/summary): Add o keymap from the summary that allows users to

do the equivalent of `Jtabedit` of the file in under the cursor

README.md

@@ -545,6 +545,7 @@ revision via `jj diffedit`. Immutable revisions show an error on write.
             diff = "<S-d>",                   -- Diff file at this revision
             edit = "<CR>",                    -- Edit revision and open file
             edit_immutable = "<S-CR>",        -- Edit revision (ignore immutability) and open file
+            edit_file = "o",                  -- Open the file under cursor in a new tab like `:Jtabedit` would
         },
       },
       -- Status buffer keymaps (set to nil to disable)

lua/jj/cmd/init.lua

@@ -76,6 +76,7 @@ local split_module = require("jj.cmd.split")
 --- @field diff? string|string[]
 --- @field edit? string|string[]
 --- @field edit_immutable? string|string[]
+--- @field edit_file? string|string[]
 
 --- @class jj.cmd.bookmark
 --- @field prefix? string Prefix to append when creating a bookmark
@@ -185,6 +186,7 @@ M.config = {
 				diff = "<S-d>",
 				edit = "<CR>",
 				edit_immutable = "<S-CR>",
+				edit_file = "o",
 			},
 			split = "<C-s>",
 			tag_set = "<S-t>",

lua/jj/cmd/log.lua

@@ -938,6 +938,25 @@ function M.handle_summary_edit(revset, ignore_immut)
 	end, string.format("Error editing revset: `%s`", revset))
 end
 
+--- Handle edit action in summary tooltip but only for the file (like Jedit)
+--- Closes tooltip, edits the revision, and opens the file
+--- @param revset string The revision to edit
+function M.handle_summary_file_edit(revset)
+	local line = vim.api.nvim_get_current_line()
+	local filepath = parser.parse_file_info_from_status_line(line)
+	if not filepath then
+		utils.notify("No file found on this line", vim.log.levels.WARN)
+		return
+	end
+
+	-- Close the tooltip first
+	if terminal.state.tooltip_buf and vim.api.nvim_buf_is_valid(terminal.state.tooltip_buf) then
+		terminal.close_tooltip()
+	end
+
+	require("jj.file").open_target({ path = filepath.new_path, rev = revset, split = "tab" })
+end
+
 --- Get keymaps for summary tooltip
 --- @param revset string The revision being viewed
 --- @return jj.core.buffer.keymap[]
@@ -963,6 +982,12 @@ function M.summary_keymaps(revset)
 			args = { revset, true },
 			opts = { desc = "Edit revision (ignore immutability) and open file" },
 		},
+		edit_file = {
+			modes = { "n" },
+			handler = M.handle_summary_file_edit,
+			args = { revset, true },
+			opts = { desc = "Read revision in buffer like `Jedit`" },
+		},
 	}
 	return cmd.resolve_keymaps_from_specs(keymaps, specs)
 end