editor: save and reset terminal after calling EDITOR

When EDITOR is invoked to modify a commit message, it will likely
change the terminal settings, and if it misbehaves will leave the
terminal output as shown in microsoft/terminal#9359.

Instead use the recently added {push,pop}_term() functions to save
the terminal configuration and recover safely.

[1] microsoft/terminal#9359

Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>

editor.c

@@ -3,6 +3,7 @@
 #include "strbuf.h"
 #include "run-command.h"
 #include "sigchain.h"
+#include "compat/terminal.h"
 
 #ifndef DEFAULT_EDITOR
 #define DEFAULT_EDITOR "vi"
@@ -83,14 +84,17 @@ static int launch_specified_editor(const char *editor, const char *path,
 		p.env = env;
 		p.use_shell = 1;
 		p.trace2_child_class = "editor";
+		push_term(1);
 		if (start_command(&p) < 0) {
+			pop_term();
 			strbuf_release(&realpath);
 			return error("unable to start editor '%s'", editor);
 		}
 
 		sigchain_push(SIGINT, SIG_IGN);
 		sigchain_push(SIGQUIT, SIG_IGN);
 		ret = finish_command(&p);
+		pop_term();
 		strbuf_release(&realpath);
 		sig = ret - 128;
 		sigchain_pop(SIGINT);