Electron.remote.dialog.showOpenDialog limits FilePicker dialog to directory selector on Windows and Linux

[jettseale]

Describe the bug
FilePickerDialog uses Electron.remote.dialog.showOpenDialog for selecting multiple files and directories for opening (via the properties: ['openFile', 'openDirectory', 'multiSelections'] configuration). However, on Windows and Linux a single Electron.remote.dialog.showOpenDialog instance cannot be both a file selector and directory selector at the same time. If you set properties to ['openFile', 'openDirectory'] on these platforms, only a directory selector will be shown. This issue is noted in Electron's GitHub page here.

To Reproduce
Steps to reproduce the behavior:

1. Open Synectic with either a Windows or Linux machine.
2. Click on the OPEN FILE... button.
3. Navigate to a directory that contains a file.
4. See error.

Expected behavior
FilePickerDialog should show both files and directories, not just directories.

Screenshots
N/A.

Versions (please complete the following information):

• OS: Windows and Linux.
• Synectic Version: 1.0.0-beta (branch: feature/branch-switching).

Additional context
This bug was observed only on a Windows machine, but according to Electron's docs it is an issue that occurs on Linux machines as well.

[nelsonni]

2ce4a7e introduces logic to display File -> Open File... and File -> Open Directory... options when the OS is Linux or Windows, and only File -> Open... on Mac. The important logic is:

synectic/src/containers/filepicker.ts

Line 12 in 2ce4a7e

const isMac = process.platform === 'darwin';

This commit should be introduced in a PR soon, and will resolve this issue.