Add test for StyledText with fixed font metrics

[akoch-yatta]

This commit adds a test for StyledText with fixed font metrics that led to a regression with #1610

[github-actions]

Test Results

   382 files   -  1     382 suites   - 1   6m 37s ⏱️ +44s
 4 252 tests  - 34   4 242 ✅  - 32   9 💤  - 3  1 ❌ +1 
12 308 runs   - 32  12 216 ✅  - 29  91 💤  - 4  1 ❌ +1 

For more details on these failures, see this check.

Results for commit a3d9e0e. ± Comparison against base commit 534e994.

This pull request removes 35 and adds 1 tests. Note that renamed tests count towards both.

org.eclipse.swt.graphics.ImageWin32Tests ‑ testImageShouldHaveDimesionAsPerZoomLevel
org.eclipse.swt.tests.win32.Test_org_eclipse_swt_dnd_DND ‑ testByteArrayTransfer
org.eclipse.swt.tests.win32.Test_org_eclipse_swt_dnd_DND ‑ testFileTransfer
org.eclipse.swt.tests.win32.Test_org_eclipse_swt_dnd_DND ‑ testHtmlTransfer
org.eclipse.swt.tests.win32.Test_org_eclipse_swt_dnd_DND ‑ testImageTransfer_fromCopiedImage
org.eclipse.swt.tests.win32.Test_org_eclipse_swt_dnd_DND ‑ testImageTransfer_fromImage
org.eclipse.swt.tests.win32.Test_org_eclipse_swt_dnd_DND ‑ testImageTransfer_fromImageData
org.eclipse.swt.tests.win32.Test_org_eclipse_swt_dnd_DND ‑ testImageTransfer_fromImageDataFromImage
org.eclipse.swt.tests.win32.Test_org_eclipse_swt_dnd_DND ‑ testRtfTransfer
org.eclipse.swt.tests.win32.Test_org_eclipse_swt_dnd_DND ‑ testTextTransfer
…

org.eclipse.swt.tests.junit.Test_org_eclipse_swt_custom_StyledText ‑ test_bug1610_fixedLineHeightWithChangingToSmallerFont_noException