Fix CTRL-Y key binding

With tmux-based test cases

src/Makefile

@@ -22,7 +22,7 @@ VERSION    = $(shell fzf/$(BINARY64) --version)
 RELEASE32  = fzf-$(VERSION)-$(GOOS)_386
 RELEASE64  = fzf-$(VERSION)-$(GOOS)_amd64
 
-all: test release
+all: release
 
 release: build
 	cd fzf && \
@@ -30,13 +30,13 @@ release: build
 	cp $(BINARY64) $(RELEASE64) && tar -czf $(RELEASE64).tgz $(RELEASE64) && \
 	rm $(RELEASE32) $(RELEASE64)
 
-build: fzf/$(BINARY32) fzf/$(BINARY64)
+build: test fzf/$(BINARY32) fzf/$(BINARY64)
 
 test:
 	go get
 	go test -v ./...
 
-install: $(BINDIR)/fzf
+install: build $(BINDIR)/fzf
 
 uninstall:
 	rm -f $(BINDIR)/fzf $(BINDIR)/$(BINARY64)

src/terminal.go

@@ -515,7 +515,8 @@ func (t *Terminal) Loop() {
 				t.rubout("[^[:alnum:]][[:alnum:]]")
 			}
 		case C.CtrlY:
-			t.input = append(append(t.input[:t.cx], t.yanked...), t.input[t.cx:]...)
+			suffix := copySlice(t.input[t.cx:])
+			t.input = append(append(t.input[:t.cx], t.yanked...), suffix...)
 			t.cx += len(t.yanked)
 		case C.Del:
 			t.delChar()