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Eliminate the single threaded executor because it is not needed. Instead
use Timer.scheduleAtFixedRate() to trigger the Poller once per
second. This approach is more correct and simpler.

Also, ignore an empty response from the Rendezvous server (which means
that it hasn’t received any ICE Candidates from the browser
yet). Previously we attempted to JSON parse it and threw an
exception (which was logged and ignored).

Change-Id: If0bc95c754a3fd052ac32cfa966fcbcfe658f55d

This is a toggle switch component. Functionally, it behaves the same as a checkbox: the ON state is equivalent to checked.

Since iOS does not have a checkbox and only offers toggle switches, this component paves the way for an on/off component that is shared by both Android and iOS.

The toggle switch is a 2-color control, which means that there are 4 configurable colors, 2 for on and 2 for off.

Allow drawing shapes (made up with lines) and arcs (or sectors)

De-Bounce the “Connect with Code” Button in the MIT AI2 Companion

The Companion's design is to setup communications with the user's
browser and get to work. Once this process starts, enough things are in
motion that it is best to quit the Companion and start a fresh copy if a
different code is needed.

If the same code is entered more then once, we just ignore the second
attempt. This often happens when someone scans a QR Code and then
presses the "Connect" Button because they do not know that they don't
have to do that. Effectively we are "de-bouncing"

Change-Id: I06b20c5d9cdb07999a380d9f877edd111e0357c5

The original method, uniform integer modulo 100000, is biased in
distribution. Now it's replaced by built-in sampling method.

Java 7 API has comments on random.nextInt(int n):
https://docs.oracle.com/javase/7/docs/api/java/util/Random.html#nextInt(int)

It is often the case that people will want to construct a list of
components or store some information about a copmonent so that it can
be restored later. this currently requires putting all of the
initialization into the Screen's Initialize event handler. However,
many people intuitively expect that they can construct a list of
components as part of the global declaration. This changes allows for
component blocks and property getters to be used in a blocks tree with
a global declaration root node.

Change-Id: I69d26716ebf4bfcdd52465f15eaf75af1c4170cf

Change-Id: I62ae3fed73342a5f6cb7652903a09e4dd9c6d620

Change-Id: I1925eb15feb0e5f6b51e409538491fb0b5257928

Change-Id: I6d7899a36e7e2ee4dd748948a98ce6693af18650

Change-Id: I09bec5aca529b51746d3b56a5f2c4c9a4bcf5eea

Change-Id: I18e9d3f605b329dc8a307b5d799755f3c6c9ccd0

This commit introduces a new block to list operations that reverses the
order of input list and outputs the result as new list.

Change-Id: If22a6641a2586ecc6586ead9ea046cc119a2a9fc

Change-Id: Ibe249c4de10d8d8213c009728771062eabba9630

Change-Id: I32f1bba6e7f1db17321665612a8ff2c2236446fb

Change-Id: I9409f6f3f503d467b6014461d51c6f213dcb76ff

Change-Id: I4a4b0af5365581cf4663f66181991ca3c747146e

Change-Id: I7d3f5864bd65c3607a0f7083e8df44aef79c8cb9

Fixed Issue #1352:

1. Cursor changes to pointer when hovering over the backpack and zoom elements on the right side of screen.
2. Zoom elements and trashcan are now black to increase their visibility on the screen, especially when the grey sidebar is extended over them.
3. Shifted the positioning of the zoom control images from the sprites.png image so that no more ugly lines display around the controls.

Closes #1431

Change-Id: I07d684643df2f5ceaa63be8c2f45c39c8a3c0099

Change-Id: Ib180d8e18b6056e9f75e882c4bd9b8faf49f5548

Fixes #1449 Screen1 Documentation
Fixes #1450 Screen Development Guidance
Fixes #1452 Procedure Blocks

Change-Id: I572cc17f088ae443a45c6126298f3fdcb46ba46a

Resolves #1428 

Google has defined a set of permissions that they consider “dangerous”
and can only be used in an application under certain specific
circumstances and then only with special permission from Google. This is
enforced when an application is submitted to the Google Play Store, not
on a device.

This change causes these permissions to not be included in the MIT AI2
Companion. However it is controlled by the “limitPermissions()” flag in
the AppInventor features module. Change the return value to “false” to
give the Companion these permissions.

Change-Id: I0fa3b2e928e7aa53c70cd339f50ed11008fe1876

Change-Id: Ib22f2b97c0bdec3a8f24f9c60b3f5cfcc8287d7c

Change-Id: I85a11627c9d118822f91710495942def4fcd5e7d

Change-Id: Ia3b29e30091e88e1db0fb5ec02c6b0d270c17f15

Change-Id: Id03a84c068f1fbf698f968dc0b7f1b48c5e1888a

Until now, app developers needed to define event handlers for
GotFeatures and LoadError to process map features being loaded
dynamically onto a map. This is not intuitive for beginners. This
change makes it so that if an event handler isn't defined, we will do
basic handling of these events. App developers may still override the
default behavior by defining their own event handling.

Change-Id: Iaeb972e28aee51abc5957c84e8d499710b343b41

* Implement conditional permissions for Texting and PhoneCall

Change-Id: Id4b526eb0ebd83d9b811c137f6628e503333db84

Change-Id: Iea7872a0896e39c30353cd89d950c6d3779370bf

WebRTC Connections can take a while to negotiate. This change gives the
user some feedback while negotiation is taking place.

We remove the ProgressBarDialog functionality from AssetManager and
place it in a new module which is called from AssetManager and from
replmgr.js. This permits us to put up the progress dialog at connection
attempt time instead of at asset download time.

Change-Id: I28772eb92a49b8ed2aa9af9ab84b1ea10d915bcc