Restored correct function on event splitting by drag.

src/components/EventOverlay.vue

@@ -167,6 +167,24 @@ function startLocalDrag(init, evt) {
     else anchorOffset = daysInclusive(init.startDate, init.anchorDate) - 1
   }
 
+  // Capture original repeating pattern & weekday (for weekly repeats) so we can rotate relative to original
+  let originalWeekday = null
+  let originalPattern = null
+  if (init.mode === 'move') {
+    try {
+      originalWeekday = new Date(init.startDate + 'T00:00:00').getDay()
+      const baseEv = store.getEventById(init.id)
+      if (
+        baseEv &&
+        baseEv.isRepeating &&
+        baseEv.repeat === 'weeks' &&
+        Array.isArray(baseEv.repeatWeekdays)
+      ) {
+        originalPattern = [...baseEv.repeatWeekdays]
+      }
+    } catch {}
+  }
+
   dragState.value = {
     ...init,
     anchorOffset,
@@ -174,6 +192,9 @@ function startLocalDrag(init, evt) {
     eventMoved: false,
     tentativeStart: init.startDate,
     tentativeEnd: init.endDate,
+    originalWeekday,
+    originalPattern,
+    realizedId: null, // for virtual occurrence converted to real during drag
   }
 
   // Begin compound history session (single snapshot after drag completes)
@@ -238,8 +259,41 @@ function onDragPointerMove(e) {
   if (ns === st.tentativeStart && ne === st.tentativeEnd) return
   st.tentativeStart = ns
   st.tentativeEnd = ne
-  // Real-time update only for non-virtual events (avoid repeated split operations)
-  if (!st.isVirtual) {
+  if (st.mode === 'move') {
+    if (st.isVirtual) {
+      // On first movement convert virtual occurrence into a real new event (split series)
+      if (!st.realizedId) {
+        const newId = store.splitMoveVirtualOccurrence(st.id, st.startDate, ns, ne)
+        if (newId) {
+          st.realizedId = newId
+          st.id = newId
+          st.isVirtual = false
+        } else {
+          return
+        }
+      } else {
+        // Subsequent moves: update range without rotating pattern automatically
+        store.setEventRange(st.id, ns, ne, { mode: 'move', rotatePattern: false })
+      }
+    } else {
+      // Normal non-virtual move; rotate handled in setEventRange
+      store.setEventRange(st.id, ns, ne, { mode: 'move', rotatePattern: false })
+    }
+    // Manual rotation relative to original pattern (keeps pattern anchored to initially grabbed weekday)
+    if (st.originalPattern && st.originalWeekday != null) {
+      try {
+        const currentWeekday = new Date(ns + 'T00:00:00').getDay()
+        const shift = currentWeekday - st.originalWeekday
+        const rotated = store._rotateWeekdayPattern([...st.originalPattern], shift)
+        const ev = store.getEventById(st.id)
+        if (ev && ev.repeat === 'weeks') {
+          ev.repeatWeekdays = rotated
+          store.touchEvents()
+        }
+      } catch {}
+    }
+  } else if (!st.isVirtual) {
+    // Resizes on real events update immediately
     applyRangeDuringDrag(
       { id: st.id, isVirtual: st.isVirtual, mode: st.mode, startDate: ns, endDate: ne },
       ns,

src/stores/CalendarStore.js

@@ -37,6 +37,10 @@ export const useCalendarStore = defineStore('calendar', {
     },
   }),
   actions: {
+    _rotateWeekdayPattern(pattern, shift) {
+      const k = (7 - (shift % 7)) % 7
+      return pattern.slice(k).concat(pattern.slice(0, k))
+    },
     _resolveCountry(code) {
       if (!code || code !== 'auto') return code
       const locale = navigator.language || navigator.languages?.[0]
@@ -264,7 +268,7 @@ export const useCalendarStore = defineStore('calendar', {
       this.notifyEventsChanged()
     },
 
-    setEventRange(eventId, newStartStr, newEndStr, { mode = 'auto' } = {}) {
+    setEventRange(eventId, newStartStr, newEndStr, { mode = 'auto', rotatePattern = true } = {}) {
       const snapshot = this.events.get(eventId)
       if (!snapshot) return
       const prevStart = fromLocalString(snapshot.startDate, DEFAULT_TZ)
@@ -283,6 +287,7 @@ export const useCalendarStore = defineStore('calendar', {
       )
       if (
         mode === 'move' &&
+        rotatePattern &&
         snapshot.isRepeating &&
         snapshot.repeat === 'weeks' &&
         Array.isArray(snapshot.repeatWeekdays)
@@ -291,15 +296,7 @@ export const useCalendarStore = defineStore('calendar', {
         const newDow = newStart.getDay()
         const shift = newDow - oldDow
         if (shift !== 0) {
-          const rotated = [false, false, false, false, false, false, false]
-          for (let i = 0; i < 7; i++) {
-            if (snapshot.repeatWeekdays[i]) {
-              let ni = (i + shift) % 7
-              if (ni < 0) ni += 7
-              rotated[ni] = true
-            }
-          }
-          snapshot.repeatWeekdays = rotated
+          snapshot.repeatWeekdays = this._rotateWeekdayPattern(snapshot.repeatWeekdays, shift)
         }
       }
       this.events.set(eventId, { ...snapshot, isSpanning: snapshot.startDate < snapshot.endDate })
@@ -314,7 +311,7 @@ export const useCalendarStore = defineStore('calendar', {
       const baseStart = fromLocalString(base.startDate, DEFAULT_TZ)
       if (occurrenceDate <= baseStart) {
         this.setEventRange(baseId, newStartStr, newEndStr, { mode: 'move' })
-        return
+        return baseId
       }
       let keptOccurrences = 0
       if (base.repeat === 'weeks') {
@@ -359,18 +356,10 @@ export const useCalendarStore = defineStore('calendar', {
         const newWeekday = fromLocalString(newStartStr, DEFAULT_TZ).getDay()
         const shift = newWeekday - origWeekday
         if (shift !== 0) {
-          const rotated = [false, false, false, false, false, false, false]
-          for (let i = 0; i < 7; i++) {
-            if (base.repeatWeekdays[i]) {
-              let ni = (i + shift) % 7
-              if (ni < 0) ni += 7
-              rotated[ni] = true
+          repeatWeekdays = this._rotateWeekdayPattern(base.repeatWeekdays, shift)
         }
       }
-          repeatWeekdays = rotated
-        }
-      }
-      this.createEvent({
+      const newId = this.createEvent({
         title: base.title,
         startDate: newStartStr,
         endDate: newEndStr,
@@ -381,6 +370,7 @@ export const useCalendarStore = defineStore('calendar', {
         repeatWeekdays,
       })
       this.notifyEventsChanged()
+      return newId
     },
 
     splitRepeatSeries(baseId, occurrenceIndex, newStartStr, newEndStr) {