mergetools: don't let meld open all changed files on startup

In meld 3.16, a multi-file change with option '-a' results in
an overview list being opened.
In meld 3.20, a multi-file change with option '-a' results in
an overview list AND every changed file being opened.

Simply removing '-a' seems to work fine for both cases
and also behaves the same as before for single-file changes.

As per the release notes, this is due to the following change
in meld 3.19.0:
"Make the --auto-compare command line flag work again (Kai Willadsen)"

See also https://gitlab.gnome.org/GNOME/meld/-/issues/516

mercurial/defaultrc/mergetools.rc

@@ -1,168 +1,168 b''
 # Some default global settings for common merge tools
 
 [merge-tools]
 
 ; The Araxis Merge tool is configured to work with newer versions of Araxis Merge
 ; if you are using Araxis Merge 2008 or earlier, create a [merge-tools] section
 ; in your mercurial.ini file, and add one of the two following "araxis.executable"
 ; lines, depending on whether you have installed a 32 or a 64 bit version
 ; of Araxis Merge and whether you are on a 32 or 64 bit version of windows
 ;
 ;araxis.executable=${ProgramFiles}/Araxis/Araxis Merge/ConsoleCompare.exe
 ;araxis.executable=${ProgramFiles(x86)}/Araxis/Araxis Merge/ConsoleCompare.exe
 ;
 ; Please remember to remove the leading ";" to uncomment the line
 ;
 araxis.args=/3 /a2 /wait /merge /title1:"Other" /title2:"Base" /title3:"Local :"$local $other $base $local $output
 araxis.binary=True
 araxis.checkconflicts=True
 araxis.diffargs=/2 /wait /title1:$plabel1 /title2:$clabel $parent $child
 araxis.gui=True
 araxis.priority=-2
 araxis.regappend=\ConsoleCompare.exe
 araxis.regkey=SOFTWARE\Classes\TypeLib\{46799e0a-7bd1-4330-911c-9660bb964ea2}\7.0\HELPDIR
 
 ; Linux version of BeyondCompare 3 and 4 (dirdiff is version 4 only)
 bcompare.args=$local $other $base -mergeoutput=$output -ro -lefttitle=$labellocal -centertitle=$labelbase -righttitle=$labelother -outputtitle=merged -automerge -reviewconflicts -solo
 bcompare.diffargs=-lro -lefttitle=$plabel1 -righttitle=$clabel -solo -expandall $parent $child
 bcompare.gui=True
 bcompare.priority=-1
 
 ; OS X version of Beyond Compare
 bcomposx.args=$local $other $base -mergeoutput=$output -ro -lefttitle=$labellocal -centertitle=$labelbase -righttitle=$labelother -outputtitle=merged -automerge -reviewconflicts -solo
 bcomposx.diffargs=-lro -lefttitle=$plabel1 -righttitle=$clabel -solo -expandall $parent $child
 bcomposx.executable = /Applications/Beyond Compare.app/Contents/MacOS/bcomp
 bcomposx.gui=True
 bcomposx.priority=-1
 
 ; Windows version of BeyondCompare 3
 beyondcompare3.args=$local $other $base $output /ro /lefttitle=$labellocal /centertitle=$labelbase /righttitle=$labelother /automerge /reviewconflicts /solo
 beyondcompare3.diffargs=/lro /lefttitle=$plabel1 /righttitle=$clabel /solo /expandall $parent $child
 beyondcompare3.gui=True
 beyondcompare3.priority=-2
 beyondcompare3.regkey=Software\Scooter Software\Beyond Compare 3
 beyondcompare3.regkeyalt=Software\Wow6432Node\Scooter Software\Beyond Compare 3
 beyondcompare3.regname=ExePath
 
 ; Windows version of BeyondCompare 4
 beyondcompare4.args=$local $other $base /mergeoutput=$output /ro /lefttitle=$labellocal /centertitle=$labelbase /righttitle=$labelother /outputtitle=merged /automerge /reviewconflicts /solo
 beyondcompare4.diffargs=/lro /lefttitle=$plabel1 /righttitle=$clabel /solo /expandall $parent $child
 beyondcompare4.gui=True
 beyondcompare4.premerge=False
 beyondcompare4.priority=-1
 beyondcompare4.regkey=Software\Scooter Software\Beyond Compare 4
 beyondcompare4.regkeyalt=Software\Wow6432Node\Scooter Software\Beyond Compare 4
 beyondcompare4.regname=ExePath
 
 diffmerge.args=-nosplash -merge -title1=$labellocal -title2=merged -title3=$labelother $local $base $other -result=$output
 diffmerge.check=changed
 diffmerge.diffargs=--nosplash --title1=$plabel1 --title2=$clabel $parent $child
 diffmerge.gui=True
 diffmerge.priority=-7
 diffmerge.regkey=Software\SourceGear\SourceGear DiffMerge\
 diffmerge.regkeyalt=Software\Wow6432Node\SourceGear\SourceGear DiffMerge\
 diffmerge.regname=Location
 
 diffuse.args=$local $base $other
 diffuse.diffargs=$parent $child
 diffuse.gui=True
 diffuse.priority=-3
 
 ecmerge.args=$base $local $other --mode=merge3 --title0=$labelbase --title1=$labellocal --title2=$labelother --to=$output
 ecmerge.diffargs=$parent $child --mode=diff2 --title1=$plabel1 --title2=$clabel
 ecmerge.gui=True
 ecmerge.regkey=Software\Elli\xc3\xa9 Computing\Merge
 ecmerge.regkeyalt=Software\Wow6432Node\Elli\xc3\xa9 Computing\Merge
 
 # editmerge is a small script shipped in contrib.
 # It needs this config otherwise it behaves the same as internal:local
 editmerge.args=$output
 editmerge.check=changed
 editmerge.premerge=keep
 
 filemerge.args=-left $other -right $local -ancestor $base -merge $output
 filemerge.executable=/Developer/Applications/Utilities/FileMerge.app/Contents/MacOS/FileMerge
 filemerge.gui=True
 
 filemergexcode.args=-left $other -right $local -ancestor $base -merge $output
 filemergexcode.executable=/Applications/Xcode.app/Contents/Applications/FileMerge.app/Contents/MacOS/FileMerge
 filemergexcode.gui=True
 
 gpyfm.gui=True
 
 gvimdiff.args=--nofork -d -g -O $local $other $base
 gvimdiff.diffargs=--nofork -d -g -O $parent $child
 gvimdiff.priority=-9
 gvimdiff.regkey=Software\Vim\GVim
 gvimdiff.regkeyalt=Software\Wow6432Node\Vim\GVim
 gvimdiff.regname=path
 
 kdiff3.args=--auto --L1 $labelbase --L2 $labellocal --L3 $labelother $base $local $other -o $output
 kdiff3.diffargs=--L1 $plabel1 --L2 $clabel $parent $child
 kdiff3.fixeol=True
 kdiff3.gui=True
 kdiff3.regappend=\kdiff3.exe
 kdiff3.regkey=Software\KDiff3
 kdiff3.regkeyalt=Software\Wow6432Node\KDiff3
 
 meld.args=--label=$labellocal $local --label='merged' $base --label=$labelother $other -o $output --auto-merge
 meld.check=changed
-meld.diffargs=-a --label=$plabel1 $parent --label=$clabel $child
+meld.diffargs=--label=$plabel1 $parent --label=$clabel $child
 meld.gui=True
 
 merge.check=conflicts
 merge.priority=-100
 
 p4merge.args=$base $local $other $output
 p4merge.diffargs=$parent $child
 p4merge.gui=True
 p4merge.priority=-8
 p4merge.regappend=\p4merge.exe
 p4merge.regkey=Software\Perforce\Environment
 p4merge.regkeyalt=Software\Wow6432Node\Perforce\Environment
 p4merge.regname=P4INSTROOT
 
 p4mergeosx.args = $base $local $other $output
 p4mergeosx.diffargs=$parent $child
 p4mergeosx.executable = /Applications/p4merge.app/Contents/MacOS/p4merge
 p4mergeosx.gui = True
 p4mergeosx.priority=-8
 
 tkdiff.args=$local $other -a $base -o $output
 tkdiff.diffargs=-L $plabel1 $parent -L $clabel $child
 tkdiff.gui=True
 tkdiff.priority=-8
 
 tortoisemerge.args=/base:$base /mine:$local /theirs:$other /merged:$output
 tortoisemerge.check=changed
 tortoisemerge.diffargs=/base:$parent /mine:$child /basename:$plabel1 /minename:$clabel
 tortoisemerge.gui=True
 tortoisemerge.priority=-8
 tortoisemerge.regkey=Software\TortoiseSVN
 tortoisemerge.regkeyalt=Software\Wow6432Node\TortoiseSVN
 
 UltraCompare.args = $base $local $other -title1 base -title3 other
 UltraCompare.binary = True
 UltraCompare.check = conflicts,changed
 UltraCompare.diffargs=$child $parent -title1 $clabel -title2 $plabel1
 UltraCompare.gui = True
 UltraCompare.priority = -2
 UltraCompare.regkey=Software\Microsoft\Windows\CurrentVersion\App Paths\UC.exe
 UltraCompare.regkeyalt=Software\Wow6432Node\Microsoft\Windows\CurrentVersion\App Paths\UC.exe
 
 vimdiff.args=$local $other $base -c 'redraw | echomsg "hg merge conflict, type \":cq\" to abort vimdiff"'
 vimdiff.check=changed
 vimdiff.priority=-10
 winmerge.args=/e /x /wl /ub /dl $labelother /dr $labellocal $other $local $output
 winmerge.check=changed
 winmerge.diffargs=/r /e /x /ub /wl /dl $plabel1 /dr $clabel $parent $child
 winmerge.gui=True
 winmerge.priority=-10
 winmerge.regkey=Software\Thingamahoochie\WinMerge
 winmerge.regkeyalt=Software\Wow6432Node\Thingamahoochie\WinMerge\
 winmerge.regname=Executable
 
 xxdiff.args=--show-merged-pane --exit-with-merge-status --title1 $labellocal --title2 $labelbase --title3 $labelother --merged-filename $output --merge $local $base $other
 xxdiff.diffargs=--title1 $plabel1 $parent --title2 $clabel $child
 xxdiff.gui=True
 xxdiff.priority=-8