bug#14736: 24.3; "Insert" key results in question mark mouse cursor and does not send a keyboard event

[Kumaran Santhanam]

On Mac OS X, the "Insert" key on external keyboards is mapped to "Help".  
Therefore, when the "Insert" key is pressed, the mouse cursor turns into a 
question mark and the key is not passed to Emacs to process.  This is 
problematic because users may have keybindings from Linux and Windows that make 
use of the "Insert" key.

The VIM project was able to resolve this issue by using the following code in 
the sendEvent method:

<code>
    // HACK! Intercept 'help' key presses and clear the 'help key flag', else
    // Cocoa turns the mouse cursor into a question mark and goes into 'context
    // help mode' (the keyDown: event itself never reaches the text view).  By
    // clearing the 'help key flag' this event will be treated like a normal
    // key event.
    if ((NSKeyDown == type || NSKeyUp == type) && (flags & NSHelpKeyMask)) {
        flags &= ~NSHelpKeyMask;
        event = [NSEvent keyEventWithType:[event type]
                                 location:[event locationInWindow]
                            modifierFlags:flags
                                timestamp:[event timestamp]
                             windowNumber:[event windowNumber]
                                  context:[event context]
                               characters:[event characters]
              charactersIgnoringModifiers:[event charactersIgnoringModifiers]
                                isARepeat:[event isARepeat]
                                  keyCode:[event keyCode]];
</code>

The full source is here:
https://code.google.com/p/macvim/source/browse/trunk/MMApplication.m

It would be a great benefit to users if this patch could be included in the 
upcoming point release.

Thanks,
Kumaran


-----


In GNU Emacs 24.3.1 (x86_64-apple-darwin, NS apple-appkit-1038.36)
 of 2013-03-12 on bob.porkrind.org
Windowing system distributor `Apple', version 10.3.1187
Configured using:
 `configure '--host=x86_64-apple-darwin' '--build=i686-apple-darwin'
 '--with-ns' 'build_alias=i686-apple-darwin'
 'host_alias=x86_64-apple-darwin' 'CC=gcc -mmacosx-version-min=10.7
 -isystem
 
/Users/david/Xcode-10.7_4.5.2/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk/usr/include/
 
-F/Users/david/Xcode-10.7_4.5.2/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks''