Fix constant background CPU usage

nyalldawson · jef-n · commit f9219b3bdbcf · 2016-09-17T17:57:03.000+02:00
(cherry picked from commit 59583e9)
diff --git a/src/gui/qgsfilterlineedit.cpp b/src/gui/qgsfilterlineedit.cpp
@@ -46,11 +46,13 @@ QgsFilterLineEdit::QgsFilterLineEdit( QWidget* parent, const QString& nullValue
 
 void QgsFilterLineEdit::setShowClearButton( bool visible )
 {
+  bool changed = mClearButtonVisible != visible;
   mClearButtonVisible = visible;
   if ( !visible )
     mClearHover = false;
 
-  update();
+  if ( changed )
+    update();
 }
 
 void QgsFilterLineEdit::mousePressEvent( QMouseEvent* e )

Original file line number	Diff line number	Diff line change
`@@ -46,11 +46,13 @@ QgsFilterLineEdit::QgsFilterLineEdit( QWidget* parent, const QString& nullValue`
`46`	`46`
`47`	`47`	`void QgsFilterLineEdit::setShowClearButton( bool visible )`
`48`	`48`	`{`
	`49`	`+ bool changed = mClearButtonVisible != visible;`
`49`	`50`	`mClearButtonVisible = visible;`
`50`	`51`	`if ( !visible )`
`51`	`52`	`mClearHover = false;`
`52`	`53`
`53`		`- update();`
	`54`	`+ if ( changed )`
	`55`	`+ update();`
`54`	`56`	`}`
`55`	`57`
`56`	`58`	`void QgsFilterLineEdit::mousePressEvent( QMouseEvent* e )`