history: don't store duplicate entries

Signed-off-by: Moritz Poldrack <git@moritz.sh>
Acked-by: Tim Culverhouse <tim@timculverhouse.com>
Acked-by: Robin Jarry <robin@jarry.cc>

CHANGELOG.md

@@ -14,6 +14,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Changed
 
 - `:open-link` now supports link types other than HTTP(S)
+- Running the same command multiple times only adds one entry to the command
+  history.
 
 ### Fixed
 

commands/history.go

@@ -23,7 +23,9 @@ func (h *cmdHistory) Add(cmd string) {
 		h.cmdList = h.cmdList[1:]
 	}
 
+	if len(h.cmdList) == 0 || h.cmdList[len(h.cmdList)-1] != cmd {
 		h.cmdList = append(h.cmdList, cmd)
+	}
 
 	// whenever we add a new command, reset the current
 	// pointer to the "beginning" of the list