Improve Display test assert message.

[raghucssit]

No description provided.

[raghucssit]

@laeubi Please add GTK4 label we can see what are the actual returned coordinates on build machine.

[github-actions]

Test Results

   88 files   - 30     88 suites   - 30   10m 43s ⏱️ - 5m 39s
4 606 tests  - 44  4 587 ✅  - 46  19 💤 +2  0 ❌ ±0 
  261 runs   - 69    258 ✅  - 68   3 💤  - 1  0 ❌ ±0 

Results for commit 0864e01. ± Comparison against base commit 079d2a9.

This pull request removes 44 tests.

AllGTKTests Test_GtkConverter ‑ test_HeuristicASCII_dollarSign
AllGTKTests Test_GtkConverter ‑ test_HeuristicASCII_emptyString
AllGTKTests Test_GtkConverter ‑ test_HeuristicASCII_letterA
AllGTKTests Test_GtkConverter ‑ test_HeuristicASCII_letters
AllGTKTests Test_GtkConverter ‑ test_HeuristicUTF16LE_null
AllGTKTests Test_GtkConverter ‑ test_HeuristicUTF16_AsciiLetters
AllGTKTests Test_GtkConverter ‑ test_HeuristicUTF16_Asciiletter
AllGTKTests Test_GtkConverter ‑ test_HeuristicUTF16_LotsOfLetters
AllGTKTests Test_GtkConverter ‑ test_HeuristicUTF16_letter
AllGTKTests Test_GtkConverter ‑ test_HeuristicUTF16_letters
…

This pull request skips 4 tests.

org.eclipse.swt.tests.junit.Test_org_eclipse_swt_dnd_Clipboard ‑ test_getContentsBothClipboards
org.eclipse.swt.tests.junit.Test_org_eclipse_swt_dnd_Clipboard ‑ test_setContentsBothClipboards
org.eclipse.swt.tests.junit.Test_org_eclipse_swt_dnd_FileTransfer ‑ test_nativeToJava
org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Shell ‑ test_activateEventSend

♻️ This comment has been updated with latest results.