This seems to be in fact a BRL.System bug, as it happens with Max2D contexts too. The problem is that the modifiers aren't updated if the application isn't a first-responder when the key state changes. To fix, replace the first half of the bbSystemEmitOsEvent() function (in BlitzMax/mod/brl.mod/system.mod/system.macos.m) with:
void bbSystemEmitOSEvent( NSEvent *event,NSView *view,BBObject *source ){
int inView;
NSEventType type;
NSString *characters;
int ev=0,data=0,x=0,y=0,oldMods=mods,mask;
float f;
mods=[event modifierFlags];
type=[event type];
switch( type ){
case NSKeyDown:
if( data=bbSystemTranslateKey( [event keyCode] ) ){
ev=[event isARepeat] ? BBEVENT_KEYREPEAT : BBEVENT_KEYDOWN;
bbSystemEmitEvent( ev,source,data,bbSystemTranslateMods(mods),0,0,&bbNullObject );
}
characters=[event characters];
if( [characters length]!=1 ) return;
data=[characters characterAtIndex:0];
if( data>=0xf700 && data<=0xf8ff ) return;
ev=BBEVENT_KEYCHAR;
data=bbSystemTranslateChar( data );
break;
case NSKeyUp:
data=bbSystemTranslateKey( [event keyCode] );
if( !data ) return;
ev=BBEVENT_KEYUP;
break;
case NSFlagsChanged:
deltaMods=mods^oldMods;
if( deltaMods & (mask=LSHIFTMASK) ) data=KEY_LSHIFT;
else if( deltaMods & (mask=RSHIFTMASK) ) data=KEY_RSHIFT;
else if( deltaMods & (mask=LCTRLMASK) ) data=KEY_LCONTROL;
else if( deltaMods & (mask=RCTRLMASK) ) data=KEY_RCONTROL;
else if( deltaMods & (mask=LALTMASK) ) data=KEY_LALT;
else if( deltaMods & (mask=RALTMASK) ) data=KEY_RALT;
else if( deltaMods & (mask=LSYSMASK) ) data=KEY_LSYS;
else if( deltaMods & (mask=RSYSMASK) ) data=KEY_RSYS;
if( !data ) return;
ev=(mods & mask) ? BBEVENT_KEYDOWN : BBEVENT_KEYUP;
break;This changes behaviour so that modifiers are updated after every system event. A bit of a sledge-hammer to crack a walnut approach, but it works. :-)
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