Ebook viewer: remember inspector windows size

E-book viewer: Remember the size of the "Inspect" window used to examine
the book's code. Fixes #1245068 [Feature request: web inspector window size and font size](https://bugs.launchpad.net/calibre/+bug/1245068)

src/calibre/gui2/viewer/documentview.py

@@ -25,6 +25,7 @@ from calibre.gui2.viewer.position import PagePosition
 from calibre.gui2.viewer.config import config, ConfigDialog, load_themes
 from calibre.gui2.viewer.image_popup import ImagePopup
 from calibre.gui2.viewer.table_popup import TablePopup
+from calibre.gui2.viewer.inspector import WebInspector
 from calibre.ebooks.oeb.display.webview import load_html
 from calibre.constants import isxp, iswindows
 # }}}
@@ -479,6 +480,7 @@ class DocumentView(QWebView):  # {{{
         self.document = Document(self.shortcuts, parent=self,
                 debug_javascript=debug_javascript)
         self.setPage(self.document)
+        self.inspector = WebInspector(self, self.document)
         self.manager = None
         self._reference_mode = False
         self._ignore_scrollbar_signals = False
@@ -672,8 +674,7 @@ class DocumentView(QWebView):  # {{{
                 menu.addAction(self.manager.action_font_size_smaller)
 
         menu.addSeparator()
-        inspectAction = self.pageAction(self.document.InspectElement)
-        menu.addAction(inspectAction)
+        menu.addAction(_('Inspect'), self.inspect)
 
         if not text and img.isNull() and self.manager is not None:
             menu.addSeparator()
@@ -686,6 +687,11 @@ class DocumentView(QWebView):  # {{{
 
         menu.exec_(ev.globalPos())
 
+    def inspect(self):
+        self.inspector.show()
+        self.inspector.raise_()
+        self.pageAction(self.document.InspectElement).trigger()
+
     def lookup(self, *args):
         if self.manager is not None:
             t = unicode(self.selectedText()).strip()

src/calibre/gui2/viewer/inspector.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python
+# vim:fileencoding=utf-8
+from __future__ import (unicode_literals, division, absolute_import,
+                        print_function)
+
+__license__ = 'GPL v3'
+__copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
+
+from PyQt4.Qt import QDialog, QDialogButtonBox, QVBoxLayout, QIcon
+from PyQt4.QtWebKit import QWebInspector
+
+from calibre.gui2 import gprefs
+
+class WebInspector(QDialog):
+
+    def __init__(self, parent, page):
+        QDialog.__init__(self, parent)
+        self.setWindowTitle(_('Inspect book code'))
+        self.setWindowIcon(QIcon(I('debug.png')))
+        l = QVBoxLayout()
+        self.setLayout(l)
+
+        self.inspector = QWebInspector(self)
+        self.inspector.setPage(page)
+        l.addWidget(self.inspector)
+
+        self.bb = bb = QDialogButtonBox(QDialogButtonBox.Close)
+        l.addWidget(bb)
+        bb.accepted.connect(self.accept)
+        bb.rejected.connect(self.reject)
+
+        self.resize(self.sizeHint())
+
+        geom = gprefs.get('viewer_inspector_geom', None)
+        if geom is not None:
+            self.restoreGeometry(geom)
+
+    def save_geometry(self):
+        gprefs['viewer_inspector_geom'] = bytearray(self.saveGeometry())
+
+    def closeEvent(self, ev):
+        self.save_geometry()
+        return QDialog.closeEvent(self, ev)
+
+    def accept(self):
+        self.save_geometry()
+        QDialog.accept(self)
+
+    def reject(self):
+        self.save_geometry()
+        QDialog.reject(self)
+