RFR: 7120: Charts in custom pages are not auto refreshed

[Marcus Hirt]

On Fri, 5 Feb 2021 14:23:04 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> This PR addresses JMC-7120 [0], in which charts in the custom pages are not auto refreshed. This issue is a regression from the changes to the `ChartCanvas` in the threads page enhancement, sorry about that.
>> 
>> The culprit here was the wrongful removal of a `redrawChart()` call in `ChartCanvas.setChart`. Looking back through the old commits I have for the Threads Page work I couldn't find where it was removed, but it must have been pretty early into the work. I noticed that the `redrawChart()` is present in JMC 7 [1] and in the commit prior to the threads page pr going in [2], but not afterwards [3]. This PR simply adds back the redraw call.
>> 
>> gif:
>> ![7120](https://user-images.githubusercontent.com/10425301/106956199-462fcd00-6704-11eb-9dad-f60ff55590a5.gif)
>> 
>> [0] https://bugs.openjdk.java.net/browse/JMC-7120
>> [1] https://hg.openjdk.java.net/jmc/jmc7/file/63ec7d0ee8d9/application/org.openjdk.jmc.ui/src/main/java/org/openjdk/jmc/ui/misc/ChartCanvas.java#l533
>> [2] https://github.com/openjdk/jmc/blob/c3f49204ce36139ac83ccfa88b2ada26a0b2cd04/application/org.openjdk.jmc.ui/src/main/java/org/openjdk/jmc/ui/misc/ChartCanvas.java#L533
>> [3] https://github.com/openjdk/jmc/blob/5feaf25fa2a4a61236a733053dc60134c89efccf/application/org.openjdk.jmc.ui/src/main/java/org/openjdk/jmc/ui/misc/ChartCanvas.java#L716
>
> Thank you for fixing @aptmac - this should also fix the redraw problem of the range indicator. @guruhb, can you please cherry pick this one to jmc8 once it is in?

I can do the cherry-picking.

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PR: https://git.openjdk.java.net/jmc/pull/211