Receive SIGINT only in RunInteractiveShell

Temporarily reset SIGINT signal handlers and receive SIGINT in
RunInteractiveShell. Do not try to kill the process in micro when signal
is received.

internal/shell/shell.go

@@ -11,6 +11,7 @@ import (
 
 	shellquote "github.com/kballard/go-shellquote"
 	"github.com/zyedidia/micro/v2/internal/screen"
+	"github.com/zyedidia/micro/v2/internal/util"
 )
 
 // ExecCommand executes a command using exec
@@ -95,15 +96,11 @@ func RunInteractiveShell(input string, wait bool, getOutput bool) (string, error
 	cmd.Stderr = os.Stderr
 
 	// This is a trap for Ctrl-C so that it doesn't kill micro
-	// Instead we trap Ctrl-C to kill the program we're running
+	// micro is killed if the signal is ignored only on Windows, so it is
+	// received
 	c := make(chan os.Signal, 1)
+	signal.Reset(os.Interrupt)
 	signal.Notify(c, os.Interrupt)
-	go func() {
-		for range c {
-			cmd.Process.Kill()
-		}
-	}()
-
 	cmd.Start()
 	err = cmd.Wait()
 
@@ -117,6 +114,9 @@ func RunInteractiveShell(input string, wait bool, getOutput bool) (string, error
 	// Start the screen back up
 	screen.TempStart(screenb)
 
+	signal.Notify(util.Sigterm, os.Interrupt)
+	signal.Stop(c)
+
 	return output, err
 }