UI: Fix text stacking in paused indicator

Currently, the paused indicator is never undone, instead relying on the
update timer to eventually erase it away when the recording duration is
updated. If the user spams pause fast enough, the indicator will stack
several times before it is erased - especially if the unpaused branch in
the update timer never has a chance to run.

Instead of mutating the recordTime text on pause and requiring an undo,
extract the UI update to a separate function which computes the full
text based on the current state. Call this function when pause is
toggled, thereby forcing an accurate UI update that either does or does
not incude the paused text.

An added benefit is that the paused indicator now disappears
immediately.

UI/window-basic-status-bar.cpp

@@ -304,15 +304,6 @@ void OBSBasicStatusBar::UpdateRecordTime()
 	if (!paused) {
 		totalRecordSeconds++;
 
-		int seconds = totalRecordSeconds % 60;
-		int totalMinutes = totalRecordSeconds / 60;
-		int minutes = totalMinutes % 60;
-		int hours = totalMinutes / 60;
-
-		QString text = QString::asprintf("%02d:%02d:%02d", hours,
-						 minutes, seconds);
-
-		statusWidget->ui->recordTime->setText(text);
 		if (recordOutput && !statusWidget->ui->recordTime->isEnabled())
 			statusWidget->ui->recordTime->setDisabled(false);
 	} else {
@@ -322,6 +313,24 @@ void OBSBasicStatusBar::UpdateRecordTime()
 
 		streamPauseIconToggle = !streamPauseIconToggle;
 	}
+
+	UpdateRecordTimeLabel();
+}
+
+void OBSBasicStatusBar::UpdateRecordTimeLabel()
+{
+	int seconds = totalRecordSeconds % 60;
+	int totalMinutes = totalRecordSeconds / 60;
+	int minutes = totalMinutes % 60;
+	int hours = totalMinutes / 60;
+
+	QString text =
+		QString::asprintf("%02d:%02d:%02d", hours, minutes, seconds);
+	if (os_atomic_load_bool(&recording_paused)) {
+		text += QStringLiteral(" (PAUSED)");
+	}
+
+	statusWidget->ui->recordTime->setText(text);
 }
 
 void OBSBasicStatusBar::UpdateDroppedFrames()
@@ -547,21 +556,21 @@ void OBSBasicStatusBar::RecordingStopped()
 
 void OBSBasicStatusBar::RecordingPaused()
 {
-	QString text = statusWidget->ui->recordTime->text() +
-		       QStringLiteral(" (PAUSED)");
-	statusWidget->ui->recordTime->setText(text);
-
 	if (recordOutput) {
 		statusWidget->ui->recordIcon->setPixmap(recordingPausePixmap);
 		streamPauseIconToggle = true;
 	}
+
+	UpdateRecordTimeLabel();
 }
 
 void OBSBasicStatusBar::RecordingUnpaused()
 {
 	if (recordOutput) {
 		statusWidget->ui->recordIcon->setPixmap(recordingActivePixmap);
 	}
+
+	UpdateRecordTimeLabel();
 }
 
 static QPixmap GetPixmap(const QString &filename)

UI/window-basic-status-bar.hpp

@@ -84,6 +84,7 @@ class OBSBasicStatusBar : public QStatusBar {
 	void UpdateBandwidth();
 	void UpdateStreamTime();
 	void UpdateRecordTime();
+	void UpdateRecordTimeLabel();
 	void UpdateDroppedFrames();
 
 	static void OBSOutputReconnect(void *data, calldata_t *params);