Merge pull request #2074 from matrix-org/t3chguy/hide_ddg_me_after_space

hide some commands after space as they have special semantics

src/autocomplete/CommandProvider.js

@@ -47,6 +47,8 @@ export default class CommandProvider extends AutocompleteProvider {
             // The input looks like a command with arguments, perform exact match
             const name = command[1].substr(1); // strip leading `/`
             if (CommandMap[name]) {
+                // some commands, namely `me` and `ddg` don't suit having the usage shown whilst typing their arguments
+                if (!CommandMap[name].hideCompletionAfterSpace) return [];
                 matches = [CommandMap[name]];
             }
         } else {