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Ensure size of message mappings range increases monotonically. 

// FREEBIE
This commit is contained in:
Matthew Chen 2017-07-28 17:06:17 -04:00
parent 2a6df19e0e
commit a0eead37c7
1 changed files with 9 additions and 4 deletions
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13
Signal/src/ViewControllers/ConversationView/MessagesViewController.m
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@ -2285,12 +2285,17 @@ typedef enum : NSUInteger {
- (void)updateMessageMappingRangeOptions
{
// The "page" length may have been increased by loading "prev" pages at the
// top of the window.
NSUInteger pageLength = kYapDatabasePageSize * (self.page + 1);
// The "old" length may have been increased by insertions of new messages
// at the bottom of the window.
NSUInteger oldLength = [self.messageMappings numberOfItemsInGroup:self.thread.uniqueId];
NSUInteger newLength = MAX(pageLength, oldLength);
YapDatabaseViewRangeOptions *rangeOptions =
[YapDatabaseViewRangeOptions flexibleRangeWithLength:kYapDatabasePageSize * (self.page + 1)
offset:0
from:YapDatabaseViewEnd];
[YapDatabaseViewRangeOptions flexibleRangeWithLength:newLength offset:0 from:YapDatabaseViewEnd];
rangeOptions.maxLength = kYapDatabaseRangeMaxLength;
rangeOptions.maxLength = MAX(newLength, kYapDatabaseRangeMaxLength);
rangeOptions.minLength = kYapDatabaseRangeMinLength;
[self.messageMappings setRangeOptions:rangeOptions forGroup:self.thread.uniqueId];