From 1b186daa3c77f8716960104933514aff05b03f87 Mon Sep 17 00:00:00 2001
From: jkhoang313 <jkhoang313@gmail.com>
Date: Fri, 6 Nov 2020 09:14:06 -0500
Subject: [PATCH] fix: preserve time on horizontal resizing (#1795)

When an event is resized horizontally (e.g. on the Month
View), keep the time of the event the same and only change
the date.

This also fixes the bug where you cannot resize an event to
a single day because the `dates.max` or `dates.min` would
force the event to occur at least 1 day after the
`start` or `end` respectively.

Co-authored-by: Jackson Hoang <jhoang@atlassian.com>
---
 src/addons/dragAndDrop/WeekWrapper.js | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/src/addons/dragAndDrop/WeekWrapper.js b/src/addons/dragAndDrop/WeekWrapper.js
index 51ab6b109..645ceab01 100644
--- a/src/addons/dragAndDrop/WeekWrapper.js
+++ b/src/addons/dragAndDrop/WeekWrapper.js
@@ -138,6 +138,8 @@ class WeekWrapper extends React.Component {
     const { accessors, slotMetrics: metrics } = this.props
 
     let { start, end } = eventTimes(event, accessors)
+    let originalStart = start
+    let originalEnd = end
 
     let rowBox = getBoundsForNode(node)
     let cursorInRow = pointInBox(rowBox, point)
@@ -145,13 +147,8 @@ class WeekWrapper extends React.Component {
     if (direction === 'RIGHT') {
       if (cursorInRow) {
         if (metrics.last < start) return this.reset()
-        // add min
-        end = dates.add(
-          metrics.getDateForSlot(
-            getSlotAtX(rowBox, point.x, false, metrics.slots)
-          ),
-          1,
-          'day'
+        end = metrics.getDateForSlot(
+          getSlotAtX(rowBox, point.x, false, metrics.slots)
         )
       } else if (
         dates.inRange(start, metrics.first, metrics.last) ||
@@ -162,8 +159,10 @@ class WeekWrapper extends React.Component {
         this.setState({ segment: null })
         return
       }
-
-      end = dates.max(end, dates.add(start, 1, 'day'))
+      end = dates.merge(end, accessors.end(event))
+      if (dates.lt(end, start)) {
+        end = originalEnd
+      }
     } else if (direction === 'LEFT') {
       // inbetween Row
       if (cursorInRow) {
@@ -181,8 +180,10 @@ class WeekWrapper extends React.Component {
         this.reset()
         return
       }
-
-      start = dates.min(dates.add(end, -1, 'day'), start)
+      start = dates.merge(start, accessors.start(event))
+      if (dates.gt(start, end)) {
+        start = originalStart
+      }
     }
 
     this.update(event, start, end)