Include more stack frames in soft assertion failures

[SebastianFlothow]

Feature summary

Currently, a soft assertion failure (i.e. the message of an AssertJMultipleFailuresError) only contains the topmost stack frame of each individual failure. While this is often sufficient, there are cases where it isn't - e.g. when using a custom assertion via the softly.check(() -> ...) idiom, only the stack frame within the custom assertion method is visible, not the one from where it was called.

Therefore, please increase the number of stack frames shown, or make it configurable (e.g. through an instance method in AbstractSoftAssertions, or a static method in some suitable class).

[joel-costigliola]

Fair enough !

It is limited to 5 in Throwables.ERROR_DESCRIPTION_EXTRACTOR, but it should instead honor Assertions.setMaxStackTraceElementsDisplayed

[chanwonlee]

@joel-costigliola I'd be interested in contributing the fix. Would that be okay?

[joel-costigliola]

Thanks @chanwonlee