Prevent error on method signature query

scide_scnvim/Classes/SCNvimDoc/extSCNvim.sc

@@ -1,12 +1,47 @@
 + SCNvim {
-	// This function will be replaced by LSP in the future
-	*methodArgs {|method|
-		var args = Help.methodArgs(method);
-		args = args.split(Char.nl);
-		if (args.size == 1) {
-			^args[0]
-		}
-		^"";
+    // copy of `Help.methodArgs` with an additional bugfix
+    // remove this later if merged upstream
+    *getMethodArgs {|string|
+        var class, meth, f, m;
+        f = string.findRegexp("(\\w*)\\.(\\w+)").flop[1];
+        if(f.notNil) {#class, meth = f[1..]} {
+            if(string[0].isUpper) {
+                class = string;
+                meth = \new;
+            } {
+                meth = string;
+            }
+        };
+        f = {|m,c|
+            class = (c ?? {m.ownerClass}).name;
+            class = if(class.isMetaClassName) {class.asString[5..]++" *"} {class.asString++" -"};
+            if (m.argNames.notNil) { // argNames can be nil in rare cases such as `Done.freeSelf`
+                class++m.name++" ("++m.argNames[1..].collect {|n,i|
+                    n.asString++":"+m.prototypeFrame[i+1];
+                }.join(", ")++")";
+            } { "" }
+        };
+        class = class.asSymbol.asClass;
+        if(class.notNil) {
+            m = class.class.findRespondingMethodFor(meth.asSymbol);
+            ^if(m.notNil) {f.value(m,class.class)} {""};
+        } {
+            ^Class.allClasses.reject{|c|c.isMetaClass}.collect {|c|
+                c.findMethod(meth.asSymbol);
+            }.reject{|m|m.isNil}.collect {|m|
+                f.value(m);
+            }.join($\n);
+        }
+    }
+
+    // This function will be replaced by LSP in the future
+    *methodArgs {|method|
+        var args = this.getMethodArgs(method);
+        args = args.split(Char.nl);
+        if (args.size == 1) {
+            ^args[0]
+        }
+        ^"";
     }
 
     *prepareHelpFor {|text|
@@ -17,7 +52,7 @@
         SCDoc.renderer = SCNvimDocRenderer;
 
         urlString = SCNvimDoc.findHelpFile(text);
-		url = URI(urlString);
+        url = URI(urlString);
         brokenAction = {
             "Sorry no help for %".format(text).postln;
             ^nil;