[FEM] Expand Add/Remove buttons in constraint tasks

Minor UI improvement. The behavior had changed when the buttons were changed
from `QPushButton` to `QToolButton` in 64a95596459f8db6b5fce16a354913ac1d669344.

src/Mod/Fem/Gui/TaskFemConstraintContact.ui

@@ -25,6 +25,12 @@
     <layout class="QHBoxLayout" name="hLayout1_2">
      <item>
       <widget class="QToolButton" name="btnAddMaster">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Add</string>
        </property>
@@ -35,6 +41,12 @@
      </item>
      <item>
       <widget class="QToolButton" name="btnRemoveMaster">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Remove</string>
        </property>
@@ -72,6 +84,12 @@
     <layout class="QHBoxLayout" name="hLayout1_3">
      <item>
       <widget class="QToolButton" name="btnAddSlave">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Add</string>
        </property>
@@ -82,6 +100,12 @@
      </item>
      <item>
       <widget class="QToolButton" name="btnRemoveSlave">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Remove</string>
        </property>

src/Mod/Fem/Gui/TaskFemConstraintDisplacement.ui

@@ -46,6 +46,12 @@
     <layout class="QHBoxLayout" name="hLayout1">
      <item>
       <widget class="QToolButton" name="btnAdd">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Add</string>
        </property>
@@ -56,6 +62,12 @@
      </item>
      <item>
       <widget class="QToolButton" name="btnRemove">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Remove</string>
        </property>

src/Mod/Fem/Gui/TaskFemConstraintFixed.ui

@@ -25,6 +25,12 @@
     <layout class="QHBoxLayout" name="hLayout1">
      <item>
       <widget class="QToolButton" name="btnAdd">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Add</string>
        </property>
@@ -35,6 +41,12 @@
      </item>
      <item>
       <widget class="QToolButton" name="btnRemove">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Remove</string>
        </property>

src/Mod/Fem/Gui/TaskFemConstraintFluidBoundary.ui

@@ -75,6 +75,12 @@
     <layout class="QHBoxLayout" name="horizontalLayout_2">
      <item>
       <widget class="QToolButton" name="btnAdd">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Add</string>
        </property>
@@ -85,6 +91,12 @@
      </item>
      <item>
       <widget class="QToolButton" name="btnRemove">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Remove</string>
        </property>

src/Mod/Fem/Gui/TaskFemConstraintForce.ui

@@ -37,6 +37,12 @@
     <layout class="QHBoxLayout" name="horizontalLayout">
      <item>
       <widget class="QToolButton" name="btnAdd">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Add</string>
        </property>
@@ -47,6 +53,12 @@
      </item>
      <item>
       <widget class="QToolButton" name="btnRemove">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Remove</string>
        </property>

src/Mod/Fem/Gui/TaskFemConstraintHeatflux.ui

@@ -25,6 +25,12 @@
     <layout class="QHBoxLayout" name="hLayout1">
      <item>
       <widget class="QToolButton" name="btnAdd">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Add</string>
        </property>
@@ -35,6 +41,12 @@
      </item>
      <item>
       <widget class="QToolButton" name="btnRemove">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Remove</string>
        </property>

src/Mod/Fem/Gui/TaskFemConstraintPlaneRotation.ui

@@ -25,6 +25,12 @@
     <layout class="QHBoxLayout" name="hLayout1">
      <item>
       <widget class="QToolButton" name="btnAdd">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Add</string>
        </property>
@@ -35,6 +41,12 @@
      </item>
      <item>
       <widget class="QToolButton" name="btnRemove">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Remove</string>
        </property>

src/Mod/Fem/Gui/TaskFemConstraintPressure.ui

@@ -25,6 +25,12 @@
     <layout class="QHBoxLayout" name="hLayout1">
      <item>
       <widget class="QToolButton" name="btnAdd">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Add</string>
        </property>
@@ -35,6 +41,12 @@
      </item>
      <item>
       <widget class="QToolButton" name="btnRemove">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Remove</string>
        </property>

src/Mod/Fem/Gui/TaskFemConstraintSpring.ui

@@ -25,6 +25,12 @@
     <layout class="QHBoxLayout" name="hLayout1">
      <item>
       <widget class="QToolButton" name="btnAdd">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Add</string>
        </property>
@@ -35,6 +41,12 @@
      </item>
      <item>
       <widget class="QToolButton" name="btnRemove">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Remove</string>
        </property>

src/Mod/Fem/Gui/TaskFemConstraintTransform.ui

@@ -49,6 +49,18 @@
     <layout class="QHBoxLayout" name="hLayout1">
      <item>
       <widget class="QToolButton" name="btnAdd">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Add</string>
        </property>
@@ -59,6 +71,18 @@
      </item>
      <item>
       <widget class="QToolButton" name="btnRemove">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>Remove</string>
        </property>