Fix reporting of key events containing SYM and META

* doc/emacs/android.texi (Android)::(What is Android?):
(Android Startup, Android File System, Android Environment)
(Android Windowing, Android Fonts, Android Troubleshooting):
Improve section titles.
(Android Windowing): Describe the relation between keyboard
modifiers reported by Android and those in key events.
* java/org/gnu/emacs/EmacsWindow.java (onKeyDown, onKeyUp):
Clear META_SYM_ON and META_META_MASK when retrieving ASCII
characters.
* src/androidgui.h: Add ANDROID_META_MASK.
* src/androidterm.c (android_android_to_emacs_modifiers)
(android_emacs_to_android_modifiers): Transform META to Alt, and
vice versa.

1 files changed, 12 insertions, 6 deletions

diff --git a/java/org/gnu/emacs/EmacsWindow.java b/java/org/gnu/emacs/EmacsWindow.java
index 8118479319e..a1f70644e16 100644
--- a/java/org/gnu/emacs/EmacsWindow.java
+++ b/java/org/gnu/emacs/EmacsWindow.java
@@ -616,10 +616,13 @@ public final class EmacsWindow extends EmacsHandleObject
 
     state = eventModifiers (event);
 
-    /* Ignore meta-state understood by Emacs for now, or Ctrl+C will
-       not be recognized as an ASCII key press event.  */
+    /* Ignore meta-state understood by Emacs for now, or key presses
+       such as Ctrl+C and Meta+C will not be recognized as an ASCII
+       key press event.  */
+
     state_1
-      = state & ~(KeyEvent.META_ALT_MASK | KeyEvent.META_CTRL_MASK);
+      = state & ~(KeyEvent.META_ALT_MASK | KeyEvent.META_CTRL_MASK
+                  | KeyEvent.META_SYM_ON | KeyEvent.META_META_MASK);
 
     synchronized (eventStrings)
       {
@@ -646,10 +649,13 @@ public final class EmacsWindow extends EmacsHandleObject
     /* Compute the event's modifier mask.  */
     state = eventModifiers (event);
 
-    /* Ignore meta-state understood by Emacs for now, or Ctrl+C will
-       not be recognized as an ASCII key press event.  */
+    /* Ignore meta-state understood by Emacs for now, or key presses
+       such as Ctrl+C and Meta+C will not be recognized as an ASCII
+       key press event.  */
+
     state_1
-      = state & ~(KeyEvent.META_ALT_MASK | KeyEvent.META_CTRL_MASK);
+      = state & ~(KeyEvent.META_ALT_MASK | KeyEvent.META_CTRL_MASK
+                  | KeyEvent.META_SYM_ON | KeyEvent.META_META_MASK);
 
     EmacsNative.sendKeyRelease (this.handle,
                                 event.getEventTime (),