feat(omnibar): support initial query and enhance alias expansion (#2360)

* feat(omnibar): enhance `expandAlias`

on space key pressed, only match the part of input string before cursor
for an alias, not the entire input string

* feat(omnibar): support initial query for omnibar type `URLs`

Author: twio142

src/content_scripts/ui/omnibar.js

@@ -348,7 +348,10 @@ function createOmnibar(front, clipboard) {
             handler.tabbed = self.tabbed ^ evt.shiftKey;
             handler.onEnter() && front.hidePopup();
         } else if (evt.keyCode === KeyboardUtils.keyCodes.space) {
-            self.expandAlias(self.input.value, '') && evt.preventDefault();
+            const cursor = self.input.selectionStart;
+            const textBeforeCursor = self.input.value.substring(0, cursor);
+            const newQuery = self.input.value.substring(cursor);
+            self.expandAlias(textBeforeCursor, newQuery) && evt.preventDefault();
         } else if (evt.keyCode === KeyboardUtils.keyCodes.backspace) {
             self.collapseAlias() && evt.preventDefault();
         }
@@ -1043,6 +1046,9 @@ function OpenURLs(prompt, omnibar, queryFn) {
         });
     };
     self.onOpen = function(arg) {
+        if (arg) {
+            omnibar.input.value = arg;
+        }
         sequenceNumber = 0;
         queryAndList();
     };