update option for Plasma Background Roundness

--that option now supports also Automatic in order
for Latte background parts to use the Latte heuristics
in order to identify the proper roundness

app/plasma/extended/theme.cpp

@@ -85,27 +85,27 @@ bool Theme::isDarkTheme() const
 
 int Theme::bottomEdgeRoundness() const
 {
-    return (themeHasExtendedInfo() ? m_bottomEdgeRoundness : userThemeRoundness());
+    return ((themeHasExtendedInfo() && m_userRoundness == -1) ? m_bottomEdgeRoundness : userThemeRoundness());
 }
 
 int Theme::leftEdgeRoundness() const
 {
-    return (themeHasExtendedInfo() ? m_leftEdgeRoundness : userThemeRoundness());
+    return ((themeHasExtendedInfo() && m_userRoundness == -1) ? m_leftEdgeRoundness : userThemeRoundness());
 }
 
 int Theme::topEdgeRoundness() const
 {
-    return (themeHasExtendedInfo() ? m_topEdgeRoundness : userThemeRoundness());
+    return ((themeHasExtendedInfo() && m_userRoundness == -1) ? m_topEdgeRoundness : userThemeRoundness());
 }
 
 int Theme::rightEdgeRoundness() const
 {
-    return (themeHasExtendedInfo() ? m_rightEdgeRoundness : userThemeRoundness());
+    return ((themeHasExtendedInfo() && m_userRoundness == -1) ? m_rightEdgeRoundness : userThemeRoundness());
 }
 
 int Theme::userThemeRoundness() const
 {
-    return m_userRoundness;
+    return qMax(0, m_userRoundness);
 }
 
 void Theme::setUserThemeRoundness(int roundness)
@@ -116,9 +116,7 @@ void Theme::setUserThemeRoundness(int roundness)
 
     m_userRoundness = roundness;
 
-    if (!themeHasExtendedInfo()) {
     emit roundnessChanged();
-    }
 
     saveConfig();
 }
@@ -397,7 +395,7 @@ void Theme::loadThemeLightness()
 
 void Theme::loadConfig()
 {
-    m_userRoundness = m_themeGroup.readEntry("userSetPlasmaThemeRoundness", 0);
+    setUserThemeRoundness(m_themeGroup.readEntry("userSetPlasmaThemeRoundness", -1));
 }
 
 void Theme::saveConfig()

app/plasma/extended/theme.h

@@ -113,7 +113,7 @@ private:
     int m_leftEdgeRoundness{0};
     int m_topEdgeRoundness{0};
     int m_rightEdgeRoundness{0};
-    int m_userRoundness{0};
+    int m_userRoundness{-1};
 
     QString m_themePath;
     QString m_defaultSchemePath;

app/settings/settingsdialog.cpp

@@ -136,6 +136,7 @@ SettingsDialog::SettingsDialog(QWidget *parent, Latte::Corona *corona)
     m_mouseSensitivityButtons->setExclusive(true);
 
     ui->screenTrackerSpinBox->setValue(m_corona->universalSettings()->screenTrackerInterval());
+    ui->themeRoundnessSpinBox->setSpecialValueText(i18nc("automatic background roundness","Automatic"));
     ui->themeRoundnessSpinBox->setValue(m_corona->themeExtended()->userThemeRoundness());
 
     //! About Menu

app/settings/settingsdialog.ui

@@ -946,11 +946,10 @@ This tracker is used in order to not lose any screen related update.</string>
                <item>
                 <widget class="QLabel" name="plasmaRoundnessLbl">
                  <property name="toolTip">
-                  <string>Roundness used from Latte elements in order to feel part of the current plasma theme 
-when there are no other roundness information.</string>
+                  <string>Roundness used from Latte elements in order to feel part of the current plasma theme</string>
                  </property>
                  <property name="text">
-                  <string>User set background roundness</string>
+                  <string>Background roundness</string>
                  </property>
                 </widget>
                </item>
@@ -978,8 +977,11 @@ when there are no other roundness information.</string>
                  <property name="suffix">
                   <string> px.</string>
                  </property>
+                 <property name="minimum">
+                  <number>-1</number>
+                 </property>
                  <property name="maximum">
-                  <number>24</number>
+                  <number>32</number>
                  </property>
                 </widget>
                </item>