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* Enable multiple component selection using shift key presses
* Add highlight to select components and show number of components selected
* Make selected component properties default when there is no full intersection
* Allow unselection of already selected components

The global keyword that prefixes global variables is translated, and
this translation ends up in the Blockly XML. We need to keep the
translation separate from the underlying representation so that
projects still work when switching between languages.

Change-Id: I7bc88f0a26c8dce6d256010c188d7233d8cc43f8

Autoload behavior can be overriden per session by including
autoload=false or autoload=true in the query string when loading App
Inventor.

This commit also refactors the menu construction into individual
pieces so that they can be called to be reconfigured. At the moment,
this feature is only used for the Settings menu, but it makes the
creation of each menu independent of any other menu.

Change-Id: Id220991cef5f7643465ef9648f663a52be1486ae

Change-Id: I59456500e2e89b0ce43f0f80f5d447dae8b8a2ea

Change-Id: Iae1a102a0323a65a936b21cfa36326c686e3a2c5

Change-Id: I81b2f7bfc1f6806f3a0d1aef9e658050b46050fd

Change-Id: I9a087d73674b4afe842a300693324ff559afa1cd

Change-Id: I7be76fd01960ae8f333ea7bd54d8cd8f33dc51e8

Change-Id: I9fc9e5516c329ac8b286fc075ad0b863018164bb

Change-Id: Iaac765df9371acb8672df71bb12b22e02fd40cb9

This functionality keeps the deleted project in a folder called Trash and if the project is accidentally deleted will not directly go away from App Inventor but will exist in Trash.

In Trash Window users will have functionality to permanently delete the project or restore back to My Projects or simply keep in Trash.

* Raise error when using boxed primitive types in component APIs
* Make ComponentProcessor error messages private

* Cache checkbox state for each screen
* Make hidden components checkbox screen-dependent

Change-Id: I34fc7bb333208d59e9186800fe2696621c9971af

* Reenable convert number block translations in zh_tw, zh_cn

On macOS, the application icon preparation step causes Java AWT to
create an app window. This window gains focus, even though the
buildserver is a background process. This really only affects
developers working with the sources on OS X. This change sets a flag
to inform AWT to run in headless mode, which prevents it from creating
the app window.

Change-Id: Ida725b80e67c55777437cdd69392a3fab4dcf00a

Change-Id: I9338893e68d64d67207c107b039dc4d7cfbfb556

Also supports Windows, Linux & Mac OS all in one file
Co-authored-by: Evan W. Patton <ewpatton@mit.edu>

* Add GitHub templates

Change-Id: Ib3e663aae8135694ddf423611ebcf7a7caffbd39

Give a warning when a project that uses the FusiontablesControl is
loaded. Google will be shutting down the Fusiontables service on
December 3rd, 2019.

Change-Id: I6a56853ea8a56790495b4462b1c59d5c3059eaef

Change-Id: Ic374dbabd9fad57c06b1b070ab3d84a63ba0b4e6

Change-Id: I9802f22cbe9fba8ed768de995d40b315ec3483ed

Prior to this change, YaFormEditor and YaBlocksEditor are registered
in loadDesigner, which is called from onShow. This is problematic
because if the screen hasn't been opened in the current session and
the user deletes an extension, the unopened screens are not notified
of the change. When the project is reloaded, it will fail to load
because the unopened screens still referenced the deleted extension.

This change moves the registration of YaFormEditor and YaBlocksEditor
as FormChangeListeners to the onFileLoaded method so that they are
made aware of project-level changes (like removing an extension) even
if they are never viewed in a session.

Change-Id: I8306ede85f5fb3576d810c9bd213e5e00df938ff

Change-Id: If1fe3358fb87be47a90dd90a79c794a751ab7288

App Inventor doesn't present a type hierarchy even though internally
it makes sense for objects to have shared methods defined in super
classes. However, the documentation for the properties, methods, and
events of an App Inventor component shared in this way must typically
be written generic enough so that they make sense when shown on
concrete classes. This can lead to either awkward/generic sounding
documentation or requires that the component author override all of
the relevant features on the component to provide component-specific
descriptions.

This change makes it so that descriptions of components, properties,
methods, and events can contain one or more %type% tokens that can be
substituted with the name of the concrete representation shown to the
App Inventor user. This allows for documentation to be shared at the
super class level while still making it sound specific to the
individual component type.

Change-Id: Ida4eb22bec12b2e33ac73de2bb5706d1683b227a

Change-Id: I6702e49a89777c1aa65c6a9fb766e0980d0fc380

* Implement substring search on components palette

Change-Id: I7fdc2d77430473420ed2d0e17d798a485ea16325

Change-Id: Ia4964537d457316824325bdf351a26820a51144a