after an app is minimized, the app icon does not respond when you click
the app icon on the Desktop

Remember capslock and numlock state on android system.When an anbox window
is used, compare state between android and uos. If different, make capslock
or numlock key event and send to android to change it.

release memory while creating window failed.

solve code style problem in window module.

solve problem: open some apps in one time, one app in it can not open later.
Because, task_id and id in change-475ca1c8u is not similar.

them until one.

When platform create window is not finished, multi_window_manager will post
more than one create window message event.
note: Windows destroy mast so user can not sense it.

The origin apps supports ESC back window, but such as
TencentVideo app do not support it. Now, support it.

Solve Chinese input problem: can not input Chinese punctuation like '？', '》'...

continuously maximize window will crash some app, such as qqmusic...

1.rename "register_event" -> "user_window_event",
  rename "get_register_event()" -> "get_user_window_event()".
2.add function user_event_function() to reduce Cyclomatic complexity of process_event
  in file platform/sdl/platform.cpp.
3.add Log when SDL_RegisterEvent return -1.
4.add lock in layer_composer.cpp:submit_layers to protect window in win_layers.

Set ime socket path from /tmp/ime to socket_dir()/ime_socket.
note: socket on android system is ime as old. So no need to change android code.

1. adjust code.
2. delete useless annotation

Remove tab and add space instead in window module.

x11 impliments(X11_XSetICFocus, X11_XUnsetICFocus, X11_XDestroyIC, X11_XCreateIC) are "thread safe".
In anbox, they are called by SDL_WaitForEventTimeout, SDL_CreateWindow, SDL_DestroyWindow.
But origin anbox code sets them in different thread, and then crashed in a low probability.
This commit sets them in the same thread to avoid this crash.

This commit is for android system to add gps features.

When app runs, some users operate wrong action: press ESC key, as the result,
app exists. So we will no longer send KEY_ESC message to android After ESC key
pressed.
note: In the code changes, "KEY_ESC" is not the same as "KEY_BACK" (triangle
button on mobilephone).

While left button down, calculate the point of down event.
--If in minimium button area, minimize window as result.
--If in back button area, send BACK event to android-framework.
Note: This commit code is just to do button function, button Appearance code is in android-framework.

After changing input method to Chinese input, you can type letters to combine Chinese characters, and select characters needed into editors in focus.

Since now all mouse events append EV_SYN in their handlers
and only one event is processed at a time,
remove them there and append it before sending events off.

Mouse wheel event doesn't fire off on Android
until other mouse event comes in,
make it so does fire off after scrolling.

It looks like that the Android system gets confused when both a pointer
and an touch based input device are connected to the system. As touch
support is so far only used Ubports we can keep it disabled for the
snap version but provide a configuration switch to enable it again.