band-aid fix for single quotes in commands

src/main/java/ch/njol/skript/command/CommandUsage.java

@@ -46,6 +46,10 @@ public class CommandUsage {
 	 */
 	public CommandUsage(@Nullable VariableString usage, String defaultUsage) {
 		if (usage == null) {
+			// Manually escape quotes. This is not a good solution, as it doesn't handle many other issues, like % in
+			// commands, but in lieu of re-writing the argument parser and command logic completely, I believe this is
+			// a decent stop-gap measure for using " in commands.
+			defaultUsage = defaultUsage.replaceAll("\"", "\"\"");
 			usage = VariableString.newInstance(defaultUsage);
 			assert usage != null;
 		}

src/test/skript/tests/regressions/pull-6936-single quotes in commands.sk

@@ -0,0 +1,7 @@
+command single-quotes-in-commands ["<text="success 2">"]:
+	trigger:
+		broadcast arg
+
+test "single-quotes-in-commands":
+	execute console command "single-quotes-in-commands ""success 1"""
+	execute console command "single-quotes-in-commands"