RFR: 8322135: javax/swing/JTable/JTableScrollPrintTest.java & javax/swing/JTable/PrintAllPagesTest.java throws java.lang.InternalError: HTHEME is null

[Harshitha Onkar]

On Wed, 10 Apr 2024 04:32:53 GMT, Tejesh R <tr at openjdk.org> wrote:

> Getting a theme for particular dpi failed in windows L&F during print test. Before [JDK-8294427](https://bugs.openjdk.org/browse/JDK-8294427) fix, theme was independent of DPI. After the fix (https://github.com/openjdk/jdk/commit/a63afa4aa62863d1a199a0fb7d2f56ff8fcd04fd) getting a theme in Windows L&F became dependent on DPI. Now it works fine in paint to a frame or window but for printing the DPI is computed with scaling factor which might not be w.r.t set of connected monitors and hence error is returned according to [this from windows document](https://learn.microsoft.com/en-us/windows/win32/api/uxtheme/nf-uxtheme-openthemedatafordpi). 
> The suggested fix is to handle printer cases with default dpi since in error condition 0 is returned with `openThemeImpl(widget, dpi)`. The fix seems to be working fine without causing any regression (Tested in CI systems and also the affected tests).

@TejeshR13 
Based on the PR description the source code fix looks correct. 
I was unable to test it on my local Win machine due to printer issues. The Print to PDF option isn't working too. But this is something to do with my system config and not related to the fix.
Since I wasn't able to test it completely, would like another reviewer to go through it.

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Marked as reviewed by honkar (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/18706#pullrequestreview-2009854469