Fix tab and button tooltips being truncated with ellipsis.

views/widget/tooltip_manager.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "views/widget/tooltip_manager.h"
 
 #include <vector>
 
 #include "app/gfx/text_elider.h"
 #include "views/screen.h"
@@ skipping 17 matching lines @@
     index = next_index + TooltipManager::GetLineSeparator().size();
   }
   if (next_index != text.size() && lines->size() < kMaxLines)
     lines->push_back(text.substr(index, text.size() - index));
 }
 
 // static
 int TooltipManager::GetMaxWidth(int x, int y) {
   gfx::Rect monitor_bounds =
       Screen::GetMonitorAreaNearestPoint(gfx::Point(x, y));
-  // We don't want the tooltip to get too big, otherwise it looks wrong.
-  return monitor_bounds.width() == 0 ? 400 : monitor_bounds.width() / 4;
+  // Allow the tooltip to be almost as wide as the screen.
+  // Otherwise, we would truncate important text, since we're not word-wrapping
+  // the text onto multiple lines.
+  return monitor_bounds.width() == 0 ? 800 : monitor_bounds.width() - 30;
 }
 
 // static
 void TooltipManager::TrimTooltipToFit(std::wstring* text,
                                       int* max_width,
                                       int* line_count,
                                       int x,
                                       int y) {
   *max_width = 0;
   *line_count = 0;
@@ skipping 23 matching lines @@
       return;
     }
     if (!result.empty())
       result.append(GetLineSeparator());
     result.append(elided_text);
   }
   *text = result;
 }
 
 }  // namespace views