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Fix list widget bug with counter-last when appending items (#7712)

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* Add failing test for list widget with counter-last

The failing test appends a value to a list without changing the rest of
the list, and the counter-last value doesn't get updated correctly when
that happens. Also added another test, which passes, testing removing
the last item of the list, just in case of a regression.

* Improve unit tests for counter-last list widget bug

The unit tests were looking very similar to each other, so I factored
out the common code and made them into simple data-driven tests.

* Fix bug where counter-last fails in list widget

The only scenario that was failing was when counter-last was used, but
the list was strictly appended to with no other changes made. The one
unit test that was failing now passes with this fix.

* Improve bugfix to list widget counter-last

Now we only refresh the last item if it was truly necessary.
This commit is contained in:
Robin Munn
2023-09-25 02:19:50 +07:00
committed by GitHub
parent 780e5d33a4
commit 8effb3f218
2 changed files with 34 additions and 0 deletions
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11
core/modules/widgets/list.js
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@@ -225,6 +225,8 @@ ListWidget.prototype.handleListChanges = function(changedTiddlers) {
// If we are providing an counter variable then we must refresh the items, otherwise we can rearrange them
var hasRefreshed = false,t;
if(this.counterName) {
var mustRefreshOldLast = false;
var oldLength = this.children.length;
// Cycle through the list and remove and re-insert the first item that has changed, and all the remaining items
for(t=0; t<this.list.length; t++) {
if(hasRefreshed || !this.children[t] || this.children[t].parseTreeNode.itemTitle !== this.list[t]) {
@@ -232,6 +234,9 @@ ListWidget.prototype.handleListChanges = function(changedTiddlers) {
this.removeListItem(t);
}
this.insertListItem(t,this.list[t]);
if(!hasRefreshed && t === oldLength) {
mustRefreshOldLast = true;
}
hasRefreshed = true;
} else {
// Refresh the item we're reusing
@@ -239,6 +244,12 @@ ListWidget.prototype.handleListChanges = function(changedTiddlers) {
hasRefreshed = hasRefreshed || refreshed;
}
}
// If items were inserted then we must recreate the item that used to be at the last position as it is no longer last
if(mustRefreshOldLast && oldLength > 0) {
var oldLastIdx = oldLength-1;
this.removeListItem(oldLastIdx);
this.insertListItem(oldLastIdx,this.list[oldLastIdx]);
}
// If there are items to remove and we have not refreshed then recreate the item that will now be at the last position
if(!hasRefreshed && this.children.length > this.list.length) {
this.removeListItem(this.list.length-1);