Fix clicking on a user data popup widgets

The textbox used in the tooltip was getting all clicks from the user. So on the user data popup we have to 1) don't set the title bar text, 2) if the title bar is not set the text box is hidden so will not eat all click messages.

data/strings/en.ini

@@ -519,7 +519,6 @@ in_front_toolip = For all kind of layers (background and transparents)
 title = Undo History
 
 [user_data]
-title = User Data
 user_data = User Data:
 color = Color:
 

data/themes/default/theme.xml

@@ -874,6 +874,10 @@
       <background part="tooltip_arrow" />
     </style>
 
+    <style id="tooltip_face">
+      <background color="tooltip_face" />
+    </style>
+
     <style id="tooltip_text">
       <background color="tooltip_face" />
       <text color="tooltip_text" align="left" />

data/widgets/user_data.xml

@@ -1,8 +1,8 @@
 <!-- Aseprite -->
-<!-- Copyright (C) 2001-2016 by David Capello -->
+<!-- Copyright (C) 2001-2017 by David Capello -->
 <gui>
-  <tipwindow id="user_data" text="@.title">
-    <vbox>
+  <tipwindow id="user_data">
+    <vbox style="tooltip_face">
       <label text="@.user_data" style="tooltip_text" />
       <entry id="text" magnet="true" maxsize="65535" minwidth="128" expansive="true" />
       <hbox>

src/ui/tooltips.cpp

@@ -135,6 +135,7 @@ TipWindow::TipWindow(const std::string& text)
 
   // Here we build our own custimized label for the window
   // (a text box).
+  m_textBox->setVisible(false);
   addChild(m_textBox);
   setText(text);
 
@@ -251,7 +252,12 @@ void TipWindow::onPaint(PaintEvent& ev)
 
 void TipWindow::onBuildTitleLabel()
 {
-  m_textBox->setText(text());
+  if (!text().empty()) {
+    m_textBox->setVisible(true);
+    m_textBox->setText(text());
+  }
+  else
+    m_textBox->setVisible(false);
 }
 
 } // namespace ui