Fix OS X cmd/alt key modifiers status when app is reactivated

src/she/osx/app_delegate.h

@@ -14,6 +14,8 @@
 - (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication*)sender;
 - (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication*)app;
 - (void)applicationWillTerminate:(NSNotification*)notification;
+- (void)applicationWillResignActive:(NSNotification*)notification;
+- (void)applicationDidBecomeActive:(NSNotification*)notification;
 - (BOOL)application:(NSApplication*)app openFiles:(NSArray*)filenames;
 @end
 

src/she/osx/app_delegate.mm

@@ -17,6 +17,7 @@
 #include "she/event_queue.h"
 #include "she/osx/app.h"
 #include "she/osx/generate_drop_files.h"
+#include "she/osx/view.h"
 #include "she/system.h"
 
 @implementation OSXAppDelegate
@@ -38,6 +39,20 @@
   she::queue_event(ev);
 }
 
+- (void)applicationWillResignActive:(NSNotification*)notification
+{
+  NSEvent* event = [NSApp currentEvent];
+  if (event != nil)
+    [OSXView updateKeyFlags:event];
+}
+
+- (void)applicationDidBecomeActive:(NSNotification*)notification
+{
+  NSEvent* event = [NSApp currentEvent];
+  if (event != nil)
+    [OSXView updateKeyFlags:event];
+}
+
 - (BOOL)application:(NSApplication*)app openFiles:(NSArray*)filenames
 {
   generate_drop_files_from_nsarray(filenames);

src/she/osx/view.h

@@ -28,6 +28,7 @@
 - (void)keyDown:(NSEvent*)event;
 - (void)keyUp:(NSEvent*)event;
 - (void)flagsChanged:(NSEvent*)event;
++ (void)updateKeyFlags:(NSEvent*)event;
 - (void)mouseEntered:(NSEvent*)event;
 - (void)mouseMoved:(NSEvent*)event;
 - (void)mouseExited:(NSEvent*)event;

src/she/osx/view.mm

@@ -188,7 +188,11 @@ bool is_key_pressed(KeyScancode scancode)
 - (void)flagsChanged:(NSEvent*)event
 {
   [super flagsChanged:event];
+  [OSXView updateKeyFlags:event];
+}
 
++ (void)updateKeyFlags:(NSEvent*)event
+{
   static int lastFlags = 0;
   static int flags[] = {
     NSShiftKeyMask,