Expose API to prevent QGC from saving the application window size and position on close (or restoring it on open).

src/QmlControls/MainWindowSavedState.qml

@@ -12,11 +12,14 @@ import QtQuick.Window   2.11
 import QtQuick.Controls 2.4
 import Qt.labs.settings 1.0
 
-import QGroundControl.ScreenTools 1.0
+import QGroundControl               1.0
+import QGroundControl.ScreenTools   1.0
 
 Item {
     property Window window
 
+    property bool _enabled: !ScreenTools.isMobile && QGroundControl.corePlugin.options.enableSaveMainWindowPosition
+
     Settings {
         id:         s
         category:   "MainWindowState"
@@ -29,7 +32,7 @@ Item {
     }
 
     Component.onCompleted: {
-        if (!ScreenTools.isMobile && s.width && s.height) {
+        if (_enabled && s.width && s.height) {
             window.x = s.x;
             window.y = s.y;
             window.width = s.width;
@@ -39,12 +42,12 @@ Item {
     }
 
     Connections {
-        target:                 ScreenTools.isMobile ? null : window
-        onXChanged:             saveSettingsTimer.restart()
-        onYChanged:             saveSettingsTimer.restart()
-        onWidthChanged:         saveSettingsTimer.restart()
-        onHeightChanged:        saveSettingsTimer.restart()
-        onVisibilityChanged:    saveSettingsTimer.restart()
+        target:                 window
+        onXChanged:             if(_enabled) saveSettingsTimer.restart()
+        onYChanged:             if(_enabled) saveSettingsTimer.restart()
+        onWidthChanged:         if(_enabled) saveSettingsTimer.restart()
+        onHeightChanged:        if(_enabled) saveSettingsTimer.restart()
+        onVisibilityChanged:    if(_enabled) saveSettingsTimer.restart()
     }
 
     Timer {
@@ -55,20 +58,22 @@ Item {
     }
 
     function saveSettings() {
-        switch(window.visibility) {
-        case ApplicationWindow.Windowed:
-            s.x = window.x;
-            s.y = window.y;
-            s.width = window.width;
-            s.height = window.height;
-            s.visibility = window.visibility;
-            break;
-        case ApplicationWindow.FullScreen:
-            s.visibility = window.visibility;
-            break;
-        case ApplicationWindow.Maximized:
-            s.visibility = window.visibility;
-            break;
+        if(_enabled) {
+            switch(window.visibility) {
+            case ApplicationWindow.Windowed:
+                s.x = window.x;
+                s.y = window.y;
+                s.width = window.width;
+                s.height = window.height;
+                s.visibility = window.visibility;
+                break;
+            case ApplicationWindow.FullScreen:
+                s.visibility = window.visibility;
+                break;
+            case ApplicationWindow.Maximized:
+                s.visibility = window.visibility;
+                break;
+            }
         }
     }
 }

src/api/QGCOptions.h

@@ -66,6 +66,7 @@ public:
     Q_PROPERTY(bool                     showMavlinkLogOptions           READ showMavlinkLogOptions          CONSTANT)
     Q_PROPERTY(bool                     enableMultiVehicleList          READ enableMultiVehicleList         CONSTANT)
     Q_PROPERTY(bool                     enableMapScale                  READ enableMapScale                 CONSTANT)
+    Q_PROPERTY(bool                     enableSaveMainWindowPosition    READ enableSaveMainWindowPosition   CONSTANT)
 
     /// Should QGC hide its settings menu and colapse it into one single menu (Settings and Vehicle Setup)?
     /// @return true if QGC should consolidate both menus into one.
@@ -127,6 +128,8 @@ public:
     virtual bool    showMavlinkLogOptions           () const { return true; }
     virtual bool    enableMultiVehicleList          () const { return true; }
     virtual bool    enableMapScale                  () const { return true; }
+    /// Desktop builds save the main application size and position on close (and restore it on open)
+    virtual bool    enableSaveMainWindowPosition    () const { return true; }
 
 #if defined(__mobile__)
     virtual bool    useMobileFileDialog             () const { return true;}