Added option to quit on closing the window.

This adds a configuration option to quit the app (rather than going to
the tray) when the "close" button is clicked.

app/renderer/js/main.ts

@@ -58,6 +58,7 @@ interface SettingsOptions {
 	};
 	downloadsPath: string;
 	showDownloadFolder: boolean;
+	quitOnClose: boolean;
 	flashTaskbarOnMessage?: boolean;
 	dockBouncing?: boolean;
 	loading?: AnyObject;
@@ -206,7 +207,8 @@ class ServerManagerView {
 				silent: false
 			},
 			downloadsPath: `${app.getPath('downloads')}`,
-			showDownloadFolder: false
+			showDownloadFolder: false,
+			quitOnClose: false
 		};
 
 		// Platform specific settings

app/renderer/js/pages/preference/general-section.ts

@@ -82,6 +82,10 @@ class GeneralSection extends BaseSection {
 						<div class="setting-description">${t.__('Always start minimized')}</div>
 						<div class="setting-control"></div>
 					</div>
+					<div class="setting-row" id="quitOnClose-option">
+						<div class="setting-description">${t.__('Quit when the window is closed')}</div>
+						<div class="setting-control"></div>
+					</div>
 					<div class="setting-row" id="enable-spellchecker-option">
 						<div class="setting-description">${t.__('Enable spellchecker (requires restart)')}</div>
 						<div class="setting-control"></div>
@@ -155,6 +159,7 @@ class GeneralSection extends BaseSection {
 		this.removeCustomCSS();
 		this.downloadFolder();
 		this.showDownloadFolder();
+		this.updateQuitOnCloseOption();
 		this.enableErrorReporting();
 
 		// Platform specific settings
@@ -321,6 +326,18 @@ class GeneralSection extends BaseSection {
 		});
 	}
 
+	updateQuitOnCloseOption(): void {
+		this.generateSettingOption({
+			$element: document.querySelector('#quitOnClose-option .setting-control'),
+			value: ConfigUtil.getConfigItem('quitOnClose', false),
+			clickHandler: () => {
+				const newValue = !ConfigUtil.getConfigItem('quitOnClose');
+				ConfigUtil.setConfigItem('quitOnClose', newValue);
+				this.updateQuitOnCloseOption();
+			}
+		});
+	}
+
 	enableSpellchecker(): void {
 		this.generateSettingOption({
 			$element: document.querySelector('#enable-spellchecker-option .setting-control'),