fix(developer): support export of visual keyboard when Keyman for Windows not installed

[mcdurdin]

Fixes #11199.

User Testing

• TEST_EXPORT: Verify that OSK export works on a clean install of Developer.
  1. On a VM, ensure that Keyman for Windows is not installed, and verify that C:\Program Files (x86)\Common Files\Keyman\Keyman Engine does not exist or is empty.
  2. Install Keyman Developer, open a keyboard project with an On Screen Keyboard
  3. In the Keyboard editor, On Screen Keyboard tab, click Export, select 'Images and CSS in subdirectory', and export to a file.
  4. Verify that the export does not crash, and that the output HTML file renders as the exported OSK in a web browser.

[keymanapp-test-bot]

User Test Results

Test specification and instructions

• ✅ TEST_EXPORT (PASSED): Tested with the attached PR build (Keyman Developer 17.0.310-beta-test-11244) on Windows 11 OS (VM) and here is my observation: 1. Verified that there is no Keyman Engine folder exists in the mentioned path. 2. Installed Keyman Dveloper, Opened an existing keyboard project with an On Screen Keyboard. 3. In the Keyboard editor, OSK tab, Clicked the Export button. Selected 'Images and CSS in subdirectory' and exported to a file. 4. Verified that the export did not crash. 5. Opened the HTML file in a web browser and noticed that it does not show any of the exported OSK on the browser (?). Is this an expected one? (notes)

Test Artifacts

• Developer
  • Keyman Developer
  • Compiler Regression Tests
  • kmcomp.zip
• Keyboards
  • Test Keyboards
• Windows
  • Keyman for Windows
  • FirstVoices Keyboards for Windows
  • Text Editor (32 bit)
  • Text Editor (64 bit)

[darcywong00]

lgtm

[bharanidharanj]

Test Results

• TEST_EXPORT (PASSED): Tested with the attached PR build (Keyman Developer 17.0.310-beta-test-11244) on Windows 11 OS (VM) and here is my observation: 1. Verified that there is no Keyman Engine folder exists in the mentioned path. 2. Installed Keyman Dveloper, Opened an existing keyboard project with an On Screen Keyboard. 3. In the Keyboard editor, OSK tab, Clicked the Export button. Selected 'Images and CSS in subdirectory' and exported to a file. 4. Verified that the export did not crash. 5. Opened the HTML file in a web browser and noticed that it does not show any of the exported OSK on the browser (?). Is this an expected one?

..no keyman engine in the given path

..exporting file

..opened the html file in a web browser

[mcdurdin]

• 5. Opened the HTML file in a web browser and noticed that it does not show any of the exported OSK on the browser (?). Is this an expected one?

Good catch -- this was not expected! Now resolved with the latest commit.

[keyman-server]

Changes in this pull request will be available for download in Keyman version 17.0.315-beta