Make Shell.setSize() test compatible with fractional scaling

[HeikoKlare]

The test case test_setSizeLorg_eclipse_swt_graphics_Point in Test_org_eclipse_swt_widgets_Shell sporadically fails in I-Builds and constantly fails when executed locally on a non-100% monitor. Due to rounding of the point-based size when converting to pixels upon setting the shell size, the value yielded by getSize() used for result validation is not necessarily equal. This change adapts the test case to apply an according tolerance value whenever the shell zoom is not 100%.

Supposed to fix this kind of failures sporadically seen in I-Build tests:

expected: <Point {792, 536}> but was: <Point {792, 535}>

org.opentest4j.AssertionFailedError: expected: <Point {792, 536}> but was: <Point {792, 535}>
at org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:151)
at org.junit.jupiter.api.AssertionFailureBuilder.buildAndThrow(AssertionFailureBuilder.java:132)
at org.junit.jupiter.api.AssertEquals.failNotEqual(AssertEquals.java:197)
at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:182)
at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:177)
at org.junit.jupiter.api.Assertions.assertEquals(Assertions.java:1145)
at org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Shell.test_setSizeLorg_eclipse_swt_graphics_Point(Test_org_eclipse_swt_widgets_Shell.java:817)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
Suppressed: java.lang.RuntimeException: AwtScreenshot VM finished with exit code 1:
Exception in thread "main" java.awt.AWTError: no screen devices
at java.desktop/sun.awt.Win32GraphicsEnvironment.getDefaultScreenDevice(Win32GraphicsEnvironment.java:101)
at java.desktop/java.awt.Robot.<init>(Robot.java:135)
at org.eclipse.test.AwtScreenshot.main(AwtScreenshot.java:43)

at org.eclipse.test.AwtScreenshot.dumpAwtScreenshot(AwtScreenshot.java:113)
at org.eclipse.test.Screenshots.takeScreenshot(Screenshots.java:102)
at org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Widget.lambda$1(Test_org_eclipse_swt_widgets_Widget.java:79)
at java.base/java.util.Optional.ifPresent(Optional.java:178)
at org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Widget.lambda$0(Test_org_eclipse_swt_widgets_Widget.java:75)

Similar to:

• Adapt placement test in StatusDialogManagerTest for fractional scaling eclipse.platform.ui#3732

[github-actions]

Test Results

  182 files  ±0    182 suites  ±0   27m 33s ⏱️ + 1m 0s
4 723 tests ±0  4 700 ✅ ±0   23 💤 ±0  0 ❌ ±0 
6 812 runs  ±0  6 647 ✅ ±0  165 💤 ±0  0 ❌ ±0 

Results for commit a726779. ± Comparison against base commit aa1dbb8.