RFR: 6766: Add heap usage before and after GC to the Garbage Collections table

[Marcus Hirt]

On Mon, 28 Sep 2020 17:30:35 GMT, Jean-Philippe Bempel <github.com+4610701+jpbempel at openjdk.org> wrote:

> Columns are hidden for now
> 
> Here some screenshots of the changes:
> 
> ![JMC_UsedHeapBeforeAfterGC](https://user-images.githubusercontent.com/4610701/94465934-f030a300-01c0-11eb-8492-2b921f695833.png)
> 
> 
> 
> ![JMC_UsedHeapBeforeAfterGCColumns](https://user-images.githubusercontent.com/4610701/94465962-fc1c6500-01c0-11eb-8dc9-5b3346668381.png)

Changes requested by hirt (Lead).

application/org.openjdk.jmc.flightrecorder.ui/src/main/resources/org/openjdk/jmc/flightrecorder/ui/messages/internal/messages.properties
line 298:

> 296: GarbageCollectionsPage_ROW_PAUSE_PHASES_DESC=Phases of the garbage collection pauses
> 297: GarbageCollectionsPage_TIMELINE_SELECTION=Garbage Collections Timeline Selection
> 298: GarbageCollectionsPage_USED_HEAP_AFTERGC=Used Heap After GC

Underscore between AFTER and GC, and BEFORE and GC. See e.g. HEAP_SUMMARY_BEFORE_GC. Otherwise all looks fine! ��

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PR: https://git.openjdk.java.net/jmc/pull/112