Disable immediate frontend on Windows

It seems that this is no longer supported on Windows, so better switch
the default frontend to one that actually works there.

Closes #12

Author: vimpostor

src/path_registry.cpp

@@ -3,7 +3,7 @@
 void PathRegistry::add_path(Path p) {
 	paths.emplace_back(p);
 #if defined(Q_OS_UNIX) && !defined(Q_OS_DARWIN)
-	if (!quartz::util::is_wayland()) {
+	if (Settings::get()->supportsImmediate()) {
 		// if no other frontend was explicitly selected,
 		// we could begin an immediate drag now (once startup is complete)
 		Settings::get()->can_drag_immediately = true;

src/settings.cpp

@@ -1,5 +1,12 @@
 #include "settings.hpp"
 
+bool Settings::supportsImmediate() const {
+#if defined(Q_OS_WIN)
+	return false;
+#endif
+	return !quartz::util::is_wayland();
+}
+
 void Settings::setAlwaysOnBottom(const bool v) {
 	if (!suppress_always_on_bottom) {
 		always_on_bottom = v;
@@ -13,7 +20,7 @@ Settings::Frontend Settings::effective_frontend(bool outgoing) const {
 	} else if (frontend == Settings::Frontend::Auto) {
 		if (intercept) {
 			// for intercept and outgoing prefer Immediate as default frontend
-			return quartz::util::is_wayland() ? Settings::Frontend::Stdout : Settings::Frontend::Immediate;
+			return supportsImmediate() ? Settings::Frontend::Immediate : Settings::Frontend::Stdout;
 		} else {
 			// in general (not outgoing), prefer immediate and fallback to GUI
 			return can_drag_immediately ? Settings::Frontend::Immediate : Settings::Frontend::Gui;

src/settings.hpp

@@ -35,6 +35,7 @@ class Settings : public QObject {
 
 	AutoQuitBehavior auto_quit_behavior = Settings::AutoQuitBehavior::All;
 	Frontend frontend = Settings::Frontend::Auto;
+	bool supportsImmediate() const;
 	void setAlwaysOnBottom(const bool v);
 	Frontend effective_frontend(bool outgoing = false) const;
 	void setHideGui(const bool h);