frontend: Set cursor width for OBSHotkeyEdit to 0

This hides the cursor from the OBSHotkeyEdit spin boxes even when they
are in focus.
Uses a shared style owned by OBSApp.

# Conflicts:
#	frontend/utility/OBSProxyStyle.hpp

Author: sebastian-s-beckmann

frontend/OBSApp.cpp

@@ -19,6 +19,7 @@
 
 #include <components/Multiview.hpp>
 #include <utility/OBSEventFilter.hpp>
+#include <utility/OBSProxyStyle.hpp>
 #if defined(_WIN32) || defined(ENABLE_SPARKLE_UPDATER)
 #include <utility/models/branches.hpp>
 #endif
@@ -1223,6 +1224,14 @@ bool OBSApp::TranslateString(const char *lookupVal, const char **out) const
 	return text_lookup_getstr(App()->GetTextLookup(), lookupVal, out);
 }
 
+QStyle *OBSApp::GetInvisibleCursorStyle()
+{
+	if (!invisibleCursorStyle) {
+		invisibleCursorStyle = std::make_unique<OBSInvisibleCursorProxyStyle>();
+	}
+	return invisibleCursorStyle.get();
+}
+
 // Global handler to receive all QEvent::Show events so we can apply
 // display affinity on any newly created windows and dialogs without
 // caring where they are coming from (e.g. plugins).

frontend/OBSApp.hpp

@@ -94,6 +94,7 @@ class OBSApp : public QApplication {
 	OBSTheme *currentTheme = nullptr;
 	QHash<QString, OBSTheme> themes;
 	QPointer<QFileSystemWatcher> themeWatcher;
+	std::unique_ptr<QStyle> invisibleCursorStyle;
 
 	void FindThemes();
 
@@ -137,6 +138,7 @@ private slots:
 	OBSTheme *GetTheme(const QString &name);
 	bool SetTheme(const QString &name);
 	bool IsThemeDark() const { return currentTheme ? currentTheme->isDark : false; }
+	QStyle *GetInvisibleCursorStyle();
 
 	void SetBranchData(const std::string &data);
 	std::vector<UpdateBranch> GetBranches();

frontend/settings/OBSHotkeyEdit.hpp

@@ -19,6 +19,8 @@
 
 #include <obs.hpp>
 
+#include <OBSApp.hpp>
+
 #include <QLineEdit>
 
 class OBSBasicSettings;
@@ -45,13 +47,15 @@ class OBSHotkeyEdit : public QLineEdit {
 	{
 		setAttribute(Qt::WA_InputMethodEnabled, false);
 		setAttribute(Qt::WA_MacShowFocusRect, true);
+		setStyle(App()->GetInvisibleCursorStyle());
 		InitSignalHandler();
 		ResetKey();
 	}
 	OBSHotkeyEdit(QWidget *parent = nullptr) : QLineEdit(parent), original({}), settings(nullptr)
 	{
 		setAttribute(Qt::WA_InputMethodEnabled, false);
 		setAttribute(Qt::WA_MacShowFocusRect, true);
+		setStyle(App()->GetInvisibleCursorStyle());
 		InitSignalHandler();
 		ResetKey();
 	}

frontend/utility/OBSProxyStyle.cpp

@@ -13,3 +13,13 @@ int OBSProxyStyle::styleHint(StyleHint hint, const QStyleOption *option, const Q
 
 	return QProxyStyle::styleHint(hint, option, widget, returnData);
 }
+
+int OBSInvisibleCursorProxyStyle::pixelMetric(PixelMetric metric, const QStyleOption *option,
+					      const QWidget *widget) const
+{
+
+	if (metric == PM_TextCursorWidth)
+		return 0;
+
+	return QProxyStyle::pixelMetric(metric, option, widget);
+}

frontend/utility/OBSProxyStyle.hpp

@@ -13,3 +13,12 @@ class OBSProxyStyle : public QProxyStyle {
 	int styleHint(StyleHint hint, const QStyleOption *option, const QWidget *widget,
 		      QStyleHintReturn *returnData) const override;
 };
+
+class OBSInvisibleCursorProxyStyle : public OBSProxyStyle {
+	Q_OBJECT
+
+public:
+	OBSInvisibleCursorProxyStyle() : OBSProxyStyle() {}
+
+	int pixelMetric(PixelMetric pm, const QStyleOption *option, const QWidget *widget) const override;
+};