717645 - contextMenu.SelectionContext() doesn't work until page has been loaded

Status: RESOLVED DUPLICATE of bug 714914

(Add-on SDK Graveyard :: General, defect)

Description

[Henrik Skupin [:whimboo][⌚️UTC+1]]

Today I have started to dig into the Add-on SDK. And while stepping through the tutorial I have noticed that for the first example add-on the context menu is not displayed until the page has been finished loading.

file:///addon-sdk/doc/dev-guide/addon-development/implementing-simple-addon.html

Here the code snippet:

exports.main = function(options, callbacks) {
  // Create a new context menu item.
  var menuItem = contextMenu.Item({
    label: "What's this?",
    // Show this item when a selection exists.
    context: contextMenu.SelectionContext()
  });
};

Given that the context menu is not displayed something is wrong with contextMenu.SelectionContext().

Steps:
1. Run cfx run for your add-on
2. Start loading a page
3. While the page loads select some text and open the context menu

With step 3 you will see that the menu entry is not visible. I have tested this with the latest version of the AddonSDK on Github.