feature/android ad8e12b9f99 5/7: Update Android port

[Po Lu]

branch: feature/android
commit ad8e12b9f9937f999a277e2608a1098a1c494532
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Update Android port
    
    * doc/emacs/android.texi (Android File System): Document new
    behavior of starting a subprocess from /assets.
    * java/org/gnu/emacs/EmacsWindow.java (onSomeKindOfMotionEvent):
    Don't use isFromSource where not present.
    * src/androidterm.c (android_scroll_run): Avoid undefined
    behavior writing to bitfields.
    * src/callproc.c (get_current_directory): When trying to run a
    subprocess inside /assets, run it from the home directory
    instead.
---
 doc/emacs/android.texi              |  4 +++-
 java/org/gnu/emacs/EmacsWindow.java |  9 ++++++++-
 src/androidterm.c                   |  4 +++-
 src/callproc.c                      | 19 ++++++++++++++++++-
 4 files changed, 32 insertions(+), 4 deletions(-)

diff --git a/doc/emacs/android.texi b/doc/emacs/android.texi
index 428cf1049b0..65ebdfa9ab1 100644
--- a/doc/emacs/android.texi
+++ b/doc/emacs/android.texi
@@ -169,7 +169,9 @@ that result from such an implementation:
 @itemize @bullet
 @item
 Subprocesses (such as @command{ls}) can not run from the
-@file{/assets} directory.
+@file{/assets} directory; if you try to run a subprocess with
+@code{current-directory} set to @file{/assets} or a subdirectory
+thereof, it will run from the home directory instead.
 
 @item
 There are no @file{.} and @file{..} directories inside the
diff --git a/java/org/gnu/emacs/EmacsWindow.java 
b/java/org/gnu/emacs/EmacsWindow.java
index 007a2a86e68..5c481aa3ef4 100644
--- a/java/org/gnu/emacs/EmacsWindow.java
+++ b/java/org/gnu/emacs/EmacsWindow.java
@@ -875,7 +875,14 @@ public final class EmacsWindow extends EmacsHandleObject
   public boolean
   onSomeKindOfMotionEvent (MotionEvent event)
   {
-    if (!event.isFromSource (InputDevice.SOURCE_CLASS_POINTER))
+    /* isFromSource is not available until API level 18.  */
+
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2)
+      {
+       if (!event.isFromSource (InputDevice.SOURCE_CLASS_POINTER))
+         return false;
+      }
+    else if (event.getSource () != InputDevice.SOURCE_CLASS_POINTER)
       return false;
 
     switch (event.getAction ())
diff --git a/src/androidterm.c b/src/androidterm.c
index 42ce03d4e7d..8a67d128348 100644
--- a/src/androidterm.c
+++ b/src/androidterm.c
@@ -2124,8 +2124,10 @@ android_scroll_run (struct window *w, struct run *run)
   /* Cursor off.  Will be switched on again in gui_update_window_end.  */
   gui_clear_cursor (w);
 
+  /* To avoid sequence point problems, make sure to only call
+     FRAME_ANDROID_DRAWABLE once.  */
   android_copy_area (FRAME_ANDROID_DRAWABLE (f),
-                    FRAME_ANDROID_DRAWABLE (f),
+                    FRAME_ANDROID_WINDOW (f),
                     f->output_data.android->normal_gc,
                     x, from_y, width, height, x, to_y);
 
diff --git a/src/callproc.c b/src/callproc.c
index e15eebe23dd..ea9c946f158 100644
--- a/src/callproc.c
+++ b/src/callproc.c
@@ -144,7 +144,11 @@ static CHILD_SETUP_TYPE child_setup (int, int, int, char 
**, char **,
    directory if it's unreachable.  If ENCODE is true, return as a string
    suitable for a system call; otherwise, return a string in its
    internal representation.  Signal an error if the result would not be
-   an accessible directory.  */
+   an accessible directory.
+
+   If the default directory lies inside a special directory which
+   cannot be made the current working directory, and ENCODE is also
+   set, simply return the home directory.  */
 
 Lisp_Object
 get_current_directory (bool encode)
@@ -157,6 +161,19 @@ get_current_directory (bool encode)
   if (NILP (dir))
     dir = build_string ("~");
 
+#if defined HAVE_ANDROID && !defined ANDROID_STUBIFY
+
+  /* If DIR is an asset directory or a content directory, return
+     the home directory instead.  */
+
+  if (encode && (!strcmp (SSDATA (dir), "/assets")
+                || !strncmp (SSDATA (dir), "/assets/", 8)
+                || !strcmp (SSDATA (dir), "/content")
+                || !strncmp (SSDATA (dir), "/content/", 9)))
+    dir = build_string ("~");
+
+#endif /* HAVE_ANDROID && ANDROID_STUBIFY */
+
   dir = expand_and_dir_to_file (dir);
   Lisp_Object encoded_dir = ENCODE_FILE (remove_slash_colon (dir));