Fix a bug of height range with -1 or -0 (#3226)

Fixed a bug that when both heightUnknown and deferred are true, deferred is not properly reset and the program terminates abnormally.

Co-authored-by: Junegunn Choi <junegunn.c@gmail.com>

src/core.go

@@ -219,6 +219,7 @@ func Run(opts *Options, version string, revision string) {
 	determine := func(final bool) {
 		if heightUnknown {
 			if total >= maxFit || final {
+				deferred = false
 				heightUnknown = false
 				terminal.startChan <- fitpad{util.Min(total, maxFit), padHeight}
 			}

test/test_go.rb

@@ -2716,6 +2716,13 @@ class TestGoFZF < TestBase
       assert(lines.any? { _1.include?('only match') })
     end
   end
+
+  def test_height_range_with_exit_0
+    tmux.send_keys "seq 10 | #{FZF} --height ~10% --exit-0", :Enter
+    tmux.until { |lines| assert_equal 10, lines.item_count }
+    tmux.send_keys :c
+    tmux.until { |lines| assert_equal 0, lines.match_count }
+  end
 end
 
 module TestShell