[#2027] Fix date range bug

frontend/src/components/c-summary-charts.vue

@@ -535,7 +535,9 @@
 
       // skip if accidentally clicked on ramp chart
       if (this.drags.length === 2 && this.drags[1] - this.drags[0]) {
-        const tdiff = (new Date(this.filterUntilDate)).valueOf() - (new Date(this.filterSinceDate)).valueOf();
+        // additional day was added to include the date represented by filterUntilDate
+        const tdiff = (new Date(this.filterUntilDate)).valueOf() - (new Date(this.filterSinceDate)).valueOf()
+            + window.DAY_IN_MS;
         const idxs = this.drags.map((x) => (x * tdiff) / 100);
         const tsince = window.getDateStr(new Date(this.filterSinceDate).getTime() + idxs[0]);
         const tuntil = window.getDateStr(new Date(this.filterSinceDate).getTime() + idxs[1]);
@@ -633,7 +635,7 @@
     getBaseTarget(target: HTMLElement | null): HTMLElement | null {
       if (!target) {
         // Should never reach here - function assumes that target is a child of the div with class 'summary-chart__ramp'
         console.error('Error: The getBaseTarget function in c-summary-charts.vue has been called on an element that is '
         + 'not a child of the div with class summary-chart__ramp. This might affect the drag view functionality.');
         return null;
       }