Modified fix for adobe/brackets#1147 based on Glenn's work in #120

Makes sure that the default size definitely fits the available space. It will only be used on the first launch of Brackets.
Subsequent launches use stored window size and position which is adjusted automatically by the OS.

appshell/cefclient_mac.mm

@@ -275,17 +275,54 @@ - (void)createApp:(id)object {
   ClientWindowDelegate* delegate = [[ClientWindowDelegate alloc] init];
 
   // Create the main application window.
+  NSUInteger styleMask = (NSTitledWindowMask |
+                          NSClosableWindowMask |
+                          NSMiniaturizableWindowMask |
+                          NSResizableWindowMask );
+
+  // Get the available screen space
   NSRect screen_rect = [[NSScreen mainScreen] visibleFrame];
-  NSRect window_rect = { {0, screen_rect.size.height - kWindowHeight},
-    {kWindowWidth, kWindowHeight} };
+  // Start out with the content being as big as possible
+  NSRect content_rect = [NSWindow contentRectForFrameRect:screen_rect styleMask:styleMask];
+
+  // Determine the maximum height
+  const int maxHeight = kWindowHeight
+  #ifdef SHOW_TOOLBAR_UI
+    + URLBAR_HEIGHT
+  #endif
+  ;
+  // Make the content rect fit into maxHeight and kWindowWidth
+  if (content_rect.size.height > maxHeight) {
+    // First move the window up as much as we reduce it's height so it opens in the top left corner
+    content_rect.origin.y += content_rect.size.height - maxHeight;
+    content_rect.size.height = maxHeight;
+  }
+  if (content_rect.size.width > kWindowWidth) {
+    content_rect.size.width = kWindowWidth;
+  }
+
+  // Initialize the window with the adjusted default size
   NSWindow* mainWnd = [[UnderlayOpenGLHostingWindow alloc]
-                       initWithContentRect:window_rect
-                       styleMask:(NSTitledWindowMask |
-                                  NSClosableWindowMask |
-                                  NSMiniaturizableWindowMask |
-                                  NSResizableWindowMask )
+                       initWithContentRect:content_rect
+                       styleMask:styleMask
                        backing:NSBackingStoreBuffered
                        defer:NO];
+
+  // "Preclude the window controller from changing a window’s position from the
+  // one saved in the defaults system" (NSWindow Class Reference)
+  [[mainWnd windowController] setShouldCascadeWindows: NO];
+
+  // Set the "autosave" name for the window. If there is a previously stored
+  // size for the window, it will be loaded here and used to resize the window.
+  // It appears that if the stored size is too big for the screen,
+  // it is automatically adjusted to fit.
+  [mainWnd setFrameAutosaveName:APP_NAME @"MainWindow"];
+
+  // Get the actual content size of the window since setFrameAutosaveName could
+  // result in the window size changing.
+  content_rect = [mainWnd contentRectForFrameRect:[mainWnd frame]];
+
+  // Configure the rest of the window
   [mainWnd setTitle:APP_NAME];
   [mainWnd setDelegate:delegate];
   [mainWnd setCollectionBehavior: (1 << 7) /* NSWindowCollectionBehaviorFullScreenPrimary */];
@@ -301,7 +338,7 @@ - (void)createApp:(id)object {
 #ifdef SHOW_TOOLBAR_UI
   // Create the buttons.
   NSRect button_rect = [contentView bounds];
-  button_rect.origin.y = window_rect.size.height - URLBAR_HEIGHT +
+  button_rect.origin.y = content_rect.size.height - URLBAR_HEIGHT +
       (URLBAR_HEIGHT - BUTTON_HEIGHT) / 2;
   button_rect.size.height = BUTTON_HEIGHT;
   button_rect.origin.x += BUTTON_MARGIN;
@@ -353,34 +390,7 @@ - (void)createApp:(id)object {
 
   settings.web_security_disabled = true;
 
-  [[mainWnd windowController] setShouldCascadeWindows: NO];
-
-  // Set the initial default size of the window.
-  NSRect defSize = [mainWnd contentRectForFrameRect:[mainWnd frame]];
-  defSize.size.width = kWindowWidth;
-  defSize.size.height = kWindowHeight
-#ifdef SHOW_TOOLBAR_UI
-                      + URLBAR_HEIGHT
-#endif
-  ;
-
-  [mainWnd setFrame:[mainWnd frameRectForContentRect:defSize] display:NO];
-
-  // Set the "autosave" name for the window. If there is a previously stored
-  // size for the window, it will be loaded here.
-  [mainWnd setFrameAutosaveName:APP_NAME @"MainWindow"];
-
-  // Get the actual content size of the window since setFrameAutosaveName could
-  // result in the window size changing.
-  NSRect r = [mainWnd contentRectForFrameRect:[mainWnd frame]];
-
-  window_info.SetAsChild(contentView, 0, 0,
-                         r.size.width,
-                         r.size.height
-#ifdef SHOW_TOOLBAR_UI
-                         + URLBAR_HEIGHT
-#endif
-                         );
+  window_info.SetAsChild(contentView, 0, 0, content_rect.size.width, content_rect.size.height);
 
   CefBrowserHost::CreateBrowser(window_info, g_handler.get(),
                                 [[startupUrl absoluteString] UTF8String], settings);