[processing] Adjust margins, frame style in modeller to match main window style

Author: nyalldawson

python/plugins/processing/ui/DlgModeler.ui

@@ -19,7 +19,7 @@
      <number>3</number>
     </property>
     <property name="margin">
-     <number>6</number>
+     <number>2</number>
     </property>
     <item>
      <widget class="QGraphicsView" name="view"/>
@@ -55,7 +55,7 @@
        <enum>Qt::WheelFocus</enum>
       </property>
       <property name="frameShape">
-       <enum>QFrame::StyledPanel</enum>
+       <enum>QFrame::NoFrame</enum>
       </property>
       <property name="frameShadow">
        <enum>QFrame::Plain</enum>
@@ -149,7 +149,7 @@
        <enum>Qt::WheelFocus</enum>
       </property>
       <property name="frameShape">
-       <enum>QFrame::StyledPanel</enum>
+       <enum>QFrame::NoFrame</enum>
       </property>
       <property name="frameShadow">
        <enum>QFrame::Plain</enum>
@@ -171,15 +171,15 @@
          <number>4</number>
         </property>
         <property name="margin">
-         <number>6</number>
+         <number>2</number>
         </property>
         <item>
          <layout class="QVBoxLayout" name="verticalLayout_4">
           <property name="spacing">
            <number>4</number>
           </property>
           <property name="margin">
-           <number>6</number>
+           <number>0</number>
           </property>
           <item>
            <widget class="QTreeWidget" name="inputsTree">
@@ -219,7 +219,7 @@
      <number>0</number>
     </property>
     <property name="margin">
-     <number>0</number>
+     <number>2</number>
     </property>
     <item>
      <widget class="QScrollArea" name="scrollArea_3">
@@ -233,7 +233,7 @@
        <enum>Qt::WheelFocus</enum>
       </property>
       <property name="frameShape">
-       <enum>QFrame::StyledPanel</enum>
+       <enum>QFrame::NoFrame</enum>
       </property>
       <property name="frameShadow">
        <enum>QFrame::Plain</enum>
@@ -252,18 +252,18 @@
        </property>
        <layout class="QVBoxLayout" name="verticalLayout_5">
         <property name="spacing">
-         <number>4</number>
+         <number>0</number>
         </property>
         <property name="margin">
-         <number>6</number>
+         <number>2</number>
         </property>
         <item>
          <layout class="QVBoxLayout" name="verticalLayout_6">
           <property name="spacing">
-           <number>4</number>
+           <number>0</number>
           </property>
           <property name="margin">
-           <number>6</number>
+           <number>0</number>
           </property>
           <item>
            <widget class="QgsFilterLineEdit" name="searchBox">