add context help for the "add oracle layers" dialog and use QTextBrow…

…ser in qgis_help (fixes #8477)

resources/context_help/QgsOracleSourceSelect

@@ -0,0 +1,40 @@
+<h3>Add Oracle Tables</h3>
+This dialog allows you to add Oracle layers (tables with a geometry column) to the QGIS map canvas.
+<p>
+<a href="#connect">Connections</a><br/>
+<a href="#add">Adding Layers</a><br/>
+<a href="#filter">Filtering a Layer</a><br/>
+<a href="#search">Search options</a><br/>
+
+<a href="#connect">
+<h4>Connections</h4>
+</a>
+<ul>
+<li>Choose the connection to use from the drop-down box and click <label>Connect</label>.
+<li>If there are no connections, use the <label>New</label> button to create a connection.
+<li>To modify a connection, click the <label>Edit</label> button.
+</ul>
+<a name="add">
+<h4>Adding Layers</h4>
+</a>
+To add a layer:
+<ol>
+<li>Choose the desired connection from the drop-down box.
+<li>Click <label>Connect</label>.
+<li>Find the layer you want to add in the list and click on it to select it.
+<li>You can select additional layers by holding down the Ctrl key and clicking.
+<li>Click <label>Add</label> to add the layer(s) to the map.
+</ol>
+<a name="filter">
+<h4>Filtering a Layer</h4>
+</a>
+To filter a layer before adding it to the map, double click on its name or use <label>Build query</label> button. This will open the Query Builder, allowing you to build up a SQL statement to use in filtering the records.
+
+<a name="search">
+<h4>Options</h4>
+</a>
+<ul>
+<li><label>Also list tables with no geometry</label>  Indicates that tables without geometry should also be listed.
+<li><label>Keep dialog open</label> Indicated that the dialog should not be closed when tables are added.
+<li>Ticking <label>Search options</label> enables additional options for searching in different column types and using 2 search modes: <label>Wildcard</label> or <label>RegExp</label>.
+</ul>

resources/context_help/QgsPgSourceSelect

@@ -31,6 +31,10 @@ To add a layer:
 To filter a layer before adding it to the map, double click on its name or use <label>Build query</label> button. This will open the Query Builder, allowing you to build up a SQL statement to use in filtering the records.
 
 <a name="search">
-<h4>Search options</h4>
+<h4>Options</h4>
 </a>
-Ticking <label>Search options</label> enables additional options for searching in different column types and using 2 search modes: <label>Wildcard</label> or <label>RegExp</label>.
+<ul>
+<li><label>Also list tables with no geometry</label>  Indicates that tables without geometry should also be listed.
+<li><label>Keep dialog open</label> Indicated that the dialog should not be closed when tables are added.
+<li>Ticking <label>Search options</label> enables additional options for searching in different column types and using 2 search modes: <label>Wildcard</label> or <label>RegExp</label>.
+</ul>

src/helpviewer/qgshelpviewerbase.ui

@@ -26,8 +26,8 @@
     <number>0</number>
    </property>
    <item row="0" column="0">
-    <widget class="QgsWebView" name="webView">
-     <property name="url">
+    <widget class="QTextBrowser" name="webView">
+     <property name="url" stdset="0">
       <url>
        <string>about:blank</string>
       </url>
@@ -44,13 +44,6 @@
   </layout>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
- <customwidgets>
-  <customwidget>
-   <class>QgsWebView</class>
-   <extends>QWidget</extends>
-   <header>qgswebview.h</header>
-  </customwidget>
- </customwidgets>
  <resources/>
  <connections>
   <connection>