Unstable formatting of multi-line expression

[robx]

Prettier 1.19.1
Playground link

--parser babel
--use-tabs

Input:

//
// パズル固有スクリプト部 へびいちご版 hebi.js
//
(function(pidlist, classbase){
        if(typeof module==='object' && module.exports){module.exports = [pidlist, classbase];}
        else{ pzpr.classmgr.makeCustom(pidlist, classbase);}
}(
['hebi'], {
//---------------------------------------------------------
// 画像表示系
Graphic:{
        hideHatena : true,

        gridcolor_type : "LIGHT",

        fgcellcolor_func : "qnum",
        fontShadecolor : "white",
        numbercolor_func : "fixed_shaded",

        getBorderColor : function(border){
                if(!this.puzzle.getConfig('snakebd')){ return false;}

                var cell1 = border.sidecell[0], cell2 = border.sidecell[1];
                if(!cell1.isnull && !cell2.isnull &&
                   (cell1.qnum===-1 && cell2.qnum===-1) &&
                   (cell1.anum!==-1 || cell2.anum!==-1) &&
                   ( ((cell1.anum===-1)!==(cell2.anum===-1)) || (Math.abs(cell1.anum-cell2.anum)!==1)) )
                {
                        return (((!cell1.trial&&cell1.anum!==-1)||(!cell2.trial&&cell2.anum!==-1)) ? this.qanscolor : this.trialcolor);
                }
                return null;
        }
}
}));

Output:

//
// パズル固有スクリプト部 へびいちご版 hebi.js
//
(function(pidlist, classbase) {
	if (typeof module === "object" && module.exports) {
		module.exports = [pidlist, classbase];
	} else {
		pzpr.classmgr.makeCustom(pidlist, classbase);
	}
})(["hebi"], {
	//---------------------------------------------------------
	// 画像表示系
	Graphic: {
		hideHatena: true,

		gridcolor_type: "LIGHT",

		fgcellcolor_func: "qnum",
		fontShadecolor: "white",
		numbercolor_func: "fixed_shaded",

		getBorderColor: function(border) {
			if (!this.puzzle.getConfig("snakebd")) {
				return false;
			}

			var cell1 = border.sidecell[0],
				cell2 = border.sidecell[1];
			if (
				!cell1.isnull &&
				!cell2.isnull &&
				cell1.qnum === -1 && cell2.qnum === -1 &&
				(cell1.anum !== -1 || cell2.anum !== -1) &&
				((cell1.anum === -1) !== (cell2.anum === -1) ||
					Math.abs(cell1.anum - cell2.anum) !== 1)
			) {
				return (!cell1.trial && cell1.anum !== -1) ||
					(!cell2.trial && cell2.anum !== -1)
					? this.qanscolor
					: this.trialcolor;
			}
			return null;
		}
	}
});

Iterated output: (extra line-break in long condition)

//
// パズル固有スクリプト部 へびいちご版 hebi.js
//
(function(pidlist, classbase) {
	if (typeof module === "object" && module.exports) {
		module.exports = [pidlist, classbase];
	} else {
		pzpr.classmgr.makeCustom(pidlist, classbase);
	}
})(["hebi"], {
	//---------------------------------------------------------
	// 画像表示系
	Graphic: {
		hideHatena: true,

		gridcolor_type: "LIGHT",

		fgcellcolor_func: "qnum",
		fontShadecolor: "white",
		numbercolor_func: "fixed_shaded",

		getBorderColor: function(border) {
			if (!this.puzzle.getConfig("snakebd")) {
				return false;
			}

			var cell1 = border.sidecell[0],
				cell2 = border.sidecell[1];
			if (
				!cell1.isnull &&
				!cell2.isnull &&
				cell1.qnum === -1 &&
				cell2.qnum === -1 &&
				(cell1.anum !== -1 || cell2.anum !== -1) &&
				((cell1.anum === -1) !== (cell2.anum === -1) ||
					Math.abs(cell1.anum - cell2.anum) !== 1)
			) {
				return (!cell1.trial && cell1.anum !== -1) ||
					(!cell2.trial && cell2.anum !== -1)
					? this.qanscolor
					: this.trialcolor;
			}
			return null;
		}
	}
});

Expected behavior:
No change between first and second run.

[alexander-akait]

Thanks for the issue

[thorn0]

This has been fixed by #7026, but not yet released. Try it on the playground for the upcoming release.

[robx]

Oh, great! Apologies for not checking the development version. Looking forward to the new release then.