Useful tooltips for length/precision widgets

Because *I* always get tripped up by these!

Author: nyalldawson

src/ui/qgsaddattrdialogbase.ui

@@ -59,6 +59,9 @@
    </item>
    <item row="5" column="0">
     <widget class="QLabel" name="mPrecLabel">
+     <property name="toolTip">
+      <string>Maximum number of digits after the decimal place. For example 123.45 requires a field precision of 2.</string>
+     </property>
      <property name="text">
       <string>Precision</string>
      </property>
@@ -68,7 +71,11 @@
     </widget>
    </item>
    <item row="4" column="1">
-    <widget class="QSpinBox" name="mLength"/>
+    <widget class="QSpinBox" name="mLength">
+     <property name="toolTip">
+      <string>Total length of field (including the number of digits after the decimal place for decimal fields).&lt;br&gt;For example 123.45 requires a decimal field length of 5, and 123456 requires an integer field length of 6.</string>
+     </property>
+    </widget>
    </item>
    <item row="1" column="0">
     <widget class="QLabel" name="textLabel1_2">
@@ -81,10 +88,17 @@
     </widget>
    </item>
    <item row="5" column="1">
-    <widget class="QSpinBox" name="mPrec"/>
+    <widget class="QSpinBox" name="mPrec">
+     <property name="toolTip">
+      <string>Maximum number of digits after the decimal place. For example 123.45 requires a field precision of 2.</string>
+     </property>
+    </widget>
    </item>
    <item row="4" column="0">
     <widget class="QLabel" name="mLengthLabel">
+     <property name="toolTip">
+      <string>Total length of field (including the number of digits after the decimal place for decimal fields).&lt;br&gt;For example 123.45 requires a decimal field length of 5, and 123456 requires an integer field length of 6.</string>
+     </property>
      <property name="text">
       <string>Length</string>
      </property>

src/ui/qgsfieldcalculatorbase.ui

@@ -169,6 +169,9 @@
       </property>
       <item row="5" column="3">
        <widget class="QSpinBox" name="mOutputFieldPrecisionSpinBox">
+        <property name="toolTip">
+         <string>Maximum number of digits after the decimal place. For example 123.45 requires a field precision of 2.</string>
+        </property>
         <property name="value">
          <number>2</number>
         </property>
@@ -186,6 +189,9 @@
       </item>
       <item row="5" column="0">
        <widget class="QLabel" name="mOutputFieldWidthLabel">
+        <property name="toolTip">
+         <string>Total length of field (including the number of digits after the decimal place for decimal fields).&lt;br&gt;For example 123.45 requires a decimal field length of 5, and 123456 requires an integer field length of 6.</string>
+        </property>
         <property name="text">
          <string>Output field length</string>
         </property>
@@ -200,7 +206,7 @@
       <item row="5" column="1">
        <widget class="QSpinBox" name="mOutputFieldWidthSpinBox">
         <property name="toolTip">
-         <string>Length of complete output. For example 123,456 means 6 as field length.</string>
+         <string>Total length of field (including the number of digits after the decimal place for decimal fields).&lt;br&gt;For example 123.45 requires a decimal field length of 5, and 123456 requires an integer field length of 6.</string>
         </property>
         <property name="minimum">
          <number>0</number>
@@ -225,6 +231,9 @@
       </item>
       <item row="5" column="2">
        <widget class="QLabel" name="mOutputFieldPrecisionLabel">
+        <property name="toolTip">
+         <string>Maximum number of digits after the decimal place. For example 123.45 requires a field precision of 2.</string>
+        </property>
         <property name="text">
          <string>Precision</string>
         </property>