Add CommandOrControl + Plus hotkey for zoomIn without SHIFT

src/app/app.menu.js

@@ -93,6 +93,13 @@ function setupMenu() {
 			{ type: 'separator' },
 			{ role: 'resetZoom' },
 			{ role: 'zoomIn' },
+			// By default zoomIn works by "CommandOrControl + +" ("CommandOrControl + SHIFT + =")
+			// Hidden menu item adds zoomIn without SHIFT
+			{
+				role: 'zoomIn',
+				accelerator: 'CommandOrControl+=',
+				visible: false,
+			},
 			{ role: 'zoomOut' },
 			{ type: 'separator' },
 			{ role: 'togglefullscreen' },

src/app/applyWheelZoom.js

@@ -0,0 +1,38 @@
+/*
+ * @copyright Copyright (c) 2023 Grigorii Shartsev <[email protected]>
+ *
+ * @author Grigorii Shartsev <[email protected]>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * Enable zooming window by mouse wheel
+ *
+ * @param {import('electron').BrowserWindow} browserWindow - Browser window
+ */
+export function applyWheelZoom(browserWindow) {
+	browserWindow.webContents.on('zoom-changed', (event, zoomDirection) => {
+		const zoom = browserWindow.webContents.getZoomLevel()
+		// 0.5 level delta seems to be equivalent of "CTRL+" (zoomIn) and CTRL- (zoomOut) commands
+		const zoomDelta = 0.5 * (zoomDirection === 'in' ? 1 : -1)
+		const newZoom = zoom + zoomDelta
+		// Undocumented default limits for zoom level is [-8, 9] or [~23.25%, 515.97%]
+		if (newZoom >= -8 && newZoom <= 9) {
+			browserWindow.webContents.setZoomLevel(zoom + zoomDelta)
+		}
+	})
+}

src/talk/talk.window.js

@@ -24,6 +24,7 @@ const {
 	windowOpenExternalLinkHandler,
 	willNavigateExternalLinkHandler,
 } = require('../app/externalLinkHandlers.js')
+const { applyWheelZoom } = require('../app/applyWheelZoom.js')
 
 /**
  * @return {import('electron').BrowserWindow}
@@ -64,6 +65,8 @@ function createTalkWindow() {
 		window.show()
 	})
 
+	applyWheelZoom(window)
+
 	window.loadURL(TALK_WINDOW_WEBPACK_ENTRY)
 
 	return window