Fix warnings: conversion to double/float, unused variables, register keyword

rtgui/dirbrowser.cc

@@ -393,7 +393,9 @@ Gtk::TreePath DirBrowser::expandToDir (const Glib::ustring& absDirPath)
 
     char* dcpy = strdup (absDirPath.c_str());
     char* dir = strtok (dcpy, "/\\");
+#ifdef _WIN32
     int count = 0;
+#endif
     expandSuccess = true;
 
 #ifndef _WIN32
@@ -436,8 +438,9 @@ Gtk::TreePath DirBrowser::expandToDir (const Glib::ustring& absDirPath)
             ++ix;
             ++i;
         }
-
+#ifdef _WIN32
         count++;
+#endif
         dir = strtok(nullptr, "/\\");
     }
 

rtgui/editwindow.h

@@ -24,7 +24,7 @@
 #include "guiutils.h"
 
 class EditorPanel;
-class ExternalEditor;
+struct ExternalEditor;
 class RTWindow;
 
 class EditWindow :

rtgui/flatfield.cc

@@ -445,7 +445,7 @@ void FlatField::setGainMap(bool enabled) {
     flatFieldFromMetaData->set_sensitive(enabled);
     if (!enabled) {
         idle_register.add(
-            [this, enabled]() -> bool
+            [this]() -> bool
             {
                 disableListener();
                 flatFieldFromMetaData->setValue(false);

rtgui/lockablecolorpicker.h

@@ -30,7 +30,7 @@ namespace rtengine
 namespace procparams
 {
 
-class ColorManagementParams;
+struct ColorManagementParams;
 
 }
 

rtgui/pointermotionlistener.h

@@ -28,7 +28,7 @@ namespace rtengine
 namespace procparams
 {
 
-class ColorManagementParams;
+struct ColorManagementParams;
 
 }