<AWT Dev> The input method handling

[Sergey Malenkov]

Hi all,

In Oracle JDK the input method handling is slightly different from
Apple JDK. And this is a reason of some issues in IntelliJ IDEA. I
found out that the insertText method in the following file uses
lengthOfBytesUsingEncoding instead of length in characters:

http://hg.openjdk.java.net/jdk9/dev/jdk/file/e5b66323ae45/src/java.desktop/macosx/native/libawt_lwawt/awt/AWTView.m

This means that almost every Alt+Key combination generates
InputMethodEvent instead of pair of KeyEvent for PRESSED and TYPED. It
makes impossible to support custom shortcuts for all Alt+Key and
Shift+Alt+Key combinations on Mac, what is one of the reasons why
users do not want to migrate from Apple JDK to Oracle JDK on Mac.

I suggest to apply the following patch to the AWTView.m file:

--- a/src/macosx/native/sun/awt/AWTView.m Wed Dec 10 17:20:48 2014 +0400
+++ b/src/macosx/native/sun/awt/AWTView.m Wed Dec 10 19:51:56 2014 +0300
@@ -889,7 +889,7 @@
     // text, or 'text in progress'.  We also need to send the event
if we get an insert text out of the blue!
     // (i.e., when the user uses the Character palette or Inkwell),
or when the string to insert is a complex
     // Unicode value.
-    NSUInteger utf8Length = [aString
lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
+    NSUInteger utf8Length = [aString length];

     if ([self hasMarkedText] || !fProcessingKeystroke || (utf8Length > 1)) {
         JNIEnv *env = [ThreadUtilities getJNIEnv];

It makes the input method handling  more compatible with Apple JDK and
allows us to provide users the same behavior with Oracle JDK.

Do you have any objections?
Are there some hidden pitfalls?

-- 
Best regards,
Sergey A. Malenkov
JetBrains