Disable 'select all' everywhere - it's not what anyone wants

In future, when we have multi-select for events, we could use this to
select all those on the View page, but we'd probably do that as a
shortcut/button/etc there, rather than in the app or context menus.

Author: pimterry

src/index.ts

@@ -596,7 +596,10 @@ ipcMain.handle('select-application', () => {
 });
 
 // Enable the default context menu
-registerContextMenu({ showSaveImageAs: true });
+registerContextMenu({
+    showSaveImageAs: true,
+    showSelectAll: false // Weird (does web-style select-all-text), skip it
+});
 
 // Enable custom context menus, for special cases where the UI wants to define the options available
 ipcMain.handle('open-context-menu', (_event: {}, options: ContextMenuDefinition) => openContextMenu(options));

src/menu.ts

@@ -19,8 +19,7 @@ export const getMenu = (browserWindows: Electron.BrowserWindow[]) => {
                 { role: 'copy', registerAccelerator: false },
                 { role: 'paste', registerAccelerator: false },
                 { role: 'pasteAndMatchStyle', registerAccelerator: false },
-                { role: 'delete' },
-                { role: 'selectAll' }
+                { role: 'delete' }
             ]
         },
         {