Disallow using --track with --tac

Close #3234

CHANGELOG.md

@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+0.39.1
+------
+- Disallow using `--track` with `--tac` as the result can be very confusing
+- Bug fixes and improvements
+
 0.39.0
 ------
 - Added `one` event that is triggered when there's only one match

man/man1/fzf.1

@@ -95,6 +95,7 @@ Do not sort the result
 .B "--track"
 Make fzf track the current selection when the result list is updated.
 This can be useful when browsing logs using fzf with sorting disabled.
+This option is not compatible with \fB--tac\fR.
 
 .RS
 e.g.

src/options.go

@@ -1938,6 +1938,10 @@ func postProcessOptions(opts *Options) {
 		errorExit("scrollbar display width should be 1")
 	}
 
+	if opts.Track && opts.Tac {
+		errorExit("--track cannot be used with --tac")
+	}
+
 	// Default actions for CTRL-N / CTRL-P when --history is set
 	if opts.History != nil {
 		if _, prs := opts.Keymap[tui.CtrlP.AsEvent()]; !prs {