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* Make and/or blocks mutatable
Co-authored-by: Xueqi Fan <xueqifan@mit.edu>

Change-Id: I9962994dd63381016f9ca187d5e49ac1193c1596

* Update documentation for and/or blocks

Change-Id: I817a4e3362fc089b86d3473858f7be13a538211c

* Fix logic bug with operator dropdown

Change-Id: Id6739a0e534e63d20963a70e23b94d8dfc6968f6

* Fix synchronization of dropdown and label fields on load

Change-Id: Ie68a5d67a0e749232c832f7840a20f3f92622899

* Handle primary slots more robustly in mutator

Change-Id: I3ca5118684b37751ed4ef3d11006dfa224efaff3

* Implement copy and paste support in the designer

This change adds support for copying and pasting components in the
designer. It handles the entire tree from a given component (and
supports multiple roots for if we allow multiple selection in the
future). Name substitution will occur if a component exists with the
same name when pasting. Top level blocks referencing the copied
components are also included in the operation. Holding the shift key
while pasting will disable pasting the event handlers.

Resolves #726
Resolves #840

Change-Id: Ica9637f8d07e7287cd698248c60533a5e10af752

* Allow "copying" a MockForm by copying all of its children

Change-Id: Ifbb3ade0cebf4a2285f79459ddd80a3359b02819

* Implement copy-and-paste of Form

Change-Id: I5f0df1b775b9b6ac4fb9bddf188ce5b7adae53e9

* Fix pasting of visible and nonvisible components

Change-Id: I034a853118b079551d80b123ecba2ed6708e5984

* Add documentation for copy and paste functionality

Change-Id: I7dd70e7ae66e8bd186f3bfb1059a68fffa931214

* Implement multidex in the buildserver

Change-Id: I1593438f80d59e9bcf6e7eb407ce902700bc67dc

* Allow larger build limit for projects

Change-Id: Ief64d60a120d1ca9e624e3bc9dd57224064585b0

Change-Id: If329454dfdb33f99df07be008369d220a4a11de9

Change-Id: Iaad92f5476f011aeffec1e8aa1dd8e5e6dadfad0

Change-Id: I78c1666fd34346e46e68e112d02603e4de197fa5

* Fix project loading with bad text-number connections

Change-Id: I78c1666fd34346e46e68e112d02603e4de197fa5

* More thoroughly fix number detection and add unit tests

Change-Id: I52e646cbfab94cf4a317c9149146bd01fd0da49a

* Add drag-and-drop of resources into App Inventor workspace

This commit improves the usability of App Inventor by enabling drag
and drop capabilities using HTML5. Users can drag projects, keystores,
extensions, and assets into the App Inventor workspace to upload
them. Extensions and assets are only added if the project editor is
open.

Change-Id: I5373a384cb8d115b23f946659b3151a2040b42b8

* Support drag and drop with uri-lists

Change-Id: Ia9e5d800760736a220e2795c4868b393b82afd4a

* Implement checkstyle rules for App Inventor

This commit implements checkstyle for App Inventor's Java code. The
App Inventor style rules are based on the Google style rules, with an
exception added for methods in the components/runtime package that are
annotated with `@Simple*` or `@Design*` annotations. The App Inventor
specific rules are placed at the end of the appinventor_checks.xml
file.

In addition, there is a script called checkstyle_git.py that is
written in Python 3 and will check the git diff against the rules by
running checkstyle on the changed files and crossreferencing the line
numbers with the checkstyle output. This can be used as a git
pre-commit hook to check that changes conform to the style guide. The
script returns -1 on error, which will abort the commit until the
changes confirm. This behavior can be bypassed by exporting the
BYPASS_CHECKSTYLE environment variable.

These two changes are made available as ant targets:

- `ant checkstyle`: Run the checkstyle_git.py script to check the
  git diff for problems.
- `ant checkstyle-all`: Run checkstyle on the whole repo (slow).

Change-Id: I26c6049bd49d1ce3f9b8dbd48f8f115a89fb5b52

* Revamp checkstyle-git script logic

Change-Id: Ie417057b2d009ba70279e70df102851b2f4552cd

* Add custom checks for EventDispatcher in @SimpleEvent

Change-Id: I72a704e9f8d489aa08cefd50ca180b1130b3e5fa

Change-Id: I986ce001d40ff7ea4423e7a21d29e3fad3e2eabc

Change-Id: Icebd59c7b7a7e112f42514a3531cb78ef1537c01

Change-Id: I7aef0856d098b490d36d36d410dc9763ccb5a034

Cleanup the code that deals with detecting connection failures. This
change results in a more stable experience on Firefox. It also ensures
that any closed WebRTC connection is cleaned up properly. This means
that if the Companion disconnects due to the Companion being closed, or
a network failure, a new connection can be made reliably without having
to reload App Inventor in the browser.

Change-Id: I35ccba26729d7c870201165cb3821991a6f523ee

Change-Id: I9a411efca491ad548a9d8560d50b8e8fdb0ef752

Change-Id: I04821ae6834300478a31556aca32b6ef48367dd9

It turns out that the iceConnectionState on the connectionStateChange
event is about a particular ICE Candidate pair, which may not be the
selected and in use candidate pair. However checking the
iceConnectionState on the WebRTCPeer object itself yields the state of
the “selected” and in use candidate pair.

Change-Id: I7d14041300ce82a02fd1bd04b9a940f26216d802

Permit the MIT App Inventor programmer to provide their own Yandex API
key. If they do not provide one, the builtin key (for the MIT
deployment) will be used.

Having neither a user provided key or builtin key results in an error.

Change-Id: Ieb25514437133162b68fae7741ffdce5a8463d04

Co-authored-by: Li Li <lili2014@Lis-MacBook-Pro.home>

Change-Id: I4ef111feb8f7734884577c5ea50055a35bdfe1c7

Change-Id: I11239726d38d09658b9d627dc0174932f7820c16

Change-Id: Iadbfae002175a409b928f5c7e705c85cdb70566d

Change-Id: Id459b7a5963b8a8e2d64a674e0f35090621fac6a