Reduced the size of all screenshots.

[ham1]

Description

Reduced size of all png screenshots using: pngquant -f --ext .png --quality 70-95 *.png.
Most were only reduced marginally but some were reduced a lot. This should probably be done for each new screenshot to ensure source control and the doc website loads as fast as possible.
Also:
Removed workbench from a few screenshots.
Removed unused screenshots.

[codecov-io]

Codecov Report

Merging #343 into trunk will decrease coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##              trunk     #343      +/-   ##
============================================
- Coverage     58.37%   58.37%   -0.01%     
+ Complexity    10316    10210     -106     
============================================
  Files          1170     1159      -11     
  Lines         74347    74422      +75     
  Branches       7324     7361      +37     
============================================
+ Hits          43399    43442      +43     
- Misses        28421    28485      +64     
+ Partials       2527     2495      -32

Impacted Files	Coverage Δ	Complexity Δ
...pache/jmeter/report/core/SampleMetaDataParser.java	0% <0%> (-100%)	0% <0%> (-2%)
src/core/org/apache/jmeter/gui/util/MenuInfo.java	0% <0%> (-84%)	0% <0%> (-9%)
...pache/jmeter/testbeans/gui/LongPropertyEditor.java	0% <0%> (-77.78%)	0% <0%> (-4%)
...he/jmeter/assertions/gui/AbstractAssertionGui.java	50% <0%> (-50%)	1% <0%> (-1%)
...jmeter/processor/gui/AbstractPostProcessorGui.java	50% <0%> (-50%)	1% <0%> (-1%)
...c/core/org/apache/jmeter/gui/util/MenuFactory.java	0% <0%> (-34.16%)	0% <0%> (-27%)
...rg/apache/jmeter/config/gui/AbstractConfigGui.java	33.33% <0%> (-33.34%)	1% <0%> (-1%)
.../jmeter/processor/gui/AbstractPreProcessorGui.java	33.33% <0%> (-33.34%)	1% <0%> (-1%)
...org/apache/jmeter/timers/gui/AbstractTimerGui.java	33.33% <0%> (-33.34%)	1% <0%> (-1%)
...he/jmeter/visualizers/gui/AbstractListenerGui.java	33.33% <0%> (-33.34%)	1% <0%> (-1%)
... and 214 more

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[FSchumacher]

Some of those images have been reduced already in the past. In my tests pngquant will happily compress those again, but that would probably be at 0.75*0.75 quality.

[ham1]

I've updated the PR:

• removed an unused screenshot
• de-duped a screenshot and
• compressed all png images with an individual saving of more than 2048 bytes using the command line and script below.

find xdocs/ src/ test/ bin/ -iname "*.png" -print0 | xargs -0 -n 1 -P 3 ./compare-size.sh

#!/bin/bash
set -e
err_report() {
    echo "Error on line $1"
    rm -v "${2}.new"
}
trap 'err_report ${LINENO} ${1}' ERR

pngquant --quality=70-100 --output "${1}.new" "${1}"

oldSize=$(stat -c%s "${1}")
newSize=$(stat -c%s "${1}.new")
let "diff = ${oldSize} - ${newSize}" || true # if sum is 0
let "threshold = ${newSize} + (1024 * 2)"

if [[ ${oldSize} -ge ${threshold} ]]
then
    echo "${1} compressed, saved ${diff}"
    mv "${1}.new" "${1}"
else
    rm -v "${1}.new"
fi

[ham1]

Deleted the wrong branch...

[pmouawad]

Hi Team,
if there are volunteer to merge this one, thanks in advance.
Regards

[FSchumacher]

Thanks for your contribution. I ran the shell commands on current trunk, inspected the changed images and committed them.